How to Fix a Random Engine Misfire in Your Car (Code P0300)
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- Опубликовано: 13 сен 2024
- Engine misfire. How to fix a random misfire in your car DIY with Scotty Kilmer. How to stop random engine misfire code P0300 with check engine light on. Engine randomly misfires inspection, troubleshooting and repair. DIY car repair with Scotty Kilmer, an auto mechanic for the last 42 years.
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Scotty Kilmer hey bud love your vids, I'm having trouble with my Toyota avalon xls 2004. I try to turn her on but it takes for ever and when I do she runs like a champ no stutters no idling. Got the p0300 all the way to the p0306. I changed the spark plugs now I'm stuck . Still have the same problem but now my battery keeps draining trying to turn her on. My mechanic says that he believes it's the mass air flow sensor but I don't know.
Scotty Kilmer what do you think the problem might be please help ?!
Scotty Kilmer hey scot i got a few questions. About a pathfinder misfire? Pm me?
Scotty Kilmer will a bad knock sensor cause a p0300?
Scotty Kilmer what if you replace the crankshaft position sensor and it runs even worse!! What do I do now? It runs with the old but still has misfiring issues but when I replaced it with a new one it the truck kept dying!!
yes, I'm half deaf from 45 years of fixing cars, listening to loud music, and the sound of guns
Scotty Kilmer do you know sign language sir?
Technically 52 years now lol
Huh ?
@@johnnysno5054 he's talking about his age now
Mui
I liked how he covered a lot without taking up a lot of my time!
It’s what Scotty does
Me to. Yet I wonder if it is the same for my 1999 ford ranger 2.5
5 speed standard transmission.
People may troll him but he’s one hell of a mechanic.
No he's not. He often misleads people. He could cause more harm than good with his foolish "repairs". Stay away from this guy
They don't know better I suppose. I am learning a lot from this man.
@@Juice_2288 he try’s to make thing interesting
@@Juice_2288 how do you know this
@@jesselangeland7933 he doesn't. Scottys channel is geared towards the everyday car owner, so he sometimes simplifies things for the sake of brevity. Some blowhard wannabe mechanics don't like that.
This guy is awesome. He doesn't waste your time trying to act like he's on ESPN or begging for likes. He gets to the point tells you what to do and moves on. I love this dude. now I feel like I can go in and down the problems on my wife's Altima.
Scotty is the best!!! His no nonsense and straight forward approach to the trouble elimination process is just what you need to hear... and not a lot of wasted words. This guy truly understands his craft!!!
you're thinking right, start cheap with plugs and wires, and work up if needed, pray it's not internal engine damage
don't spend too much money on schooling, it's actual repair work where you really learn. If you can get at least a part time job working at a shop, do that
spark plugs, coil on plug assemblies, or bad fuel injectors are often it. Good idea is to swap coil on plugs first, and if the miss moves, replace those. And if not, try swapping fuel injectors
Scotty you are beyond cooler than Charlie sheen and Hugh heffner combined.
Jonathan Ramirez FACTS
It's called movie magic. Doesn't have to be accurate just has to get the message across
probably gets more pu$$y combined hahahahahahaha!!!
I'd recommend adding a check on the distributor for terminal corrosion. Love the Scotty Kilmer Channel. Thanks for putting all these great and super-succinct videos together. They're terrific!
yea, sometimes they are too far gone and need replacing, but it's certainly worth a try considering what new ones cost
yes, most newer cars use air fuel ratio sensors as they are more accurate (but cost tons more)
Scotty, I'd like to see a video where the hood of the car shoots up and you pop out from inside the engine bay like a "jack in the box" please.
The stunts you pull like popping out from the back of the pick up are always awesome!
Hi
Maybe doable if he took the engine out. That would be a fun twist.
do these video tests, and on that model, try my video "how to clean fuel injectors on your car" they often do that. AND also check the ignition coil on plug assemblies IF it has those and doesn't have a distributor. They often go out on that model too.
Probably one of the most informative and entertaining instructional videos on cars I have seen so far.
Scotty, Thank you for all your videos and all your hard work and knowledge. I have a 91 Oldsmobile 98, that has been hesitating between 45 and 60 miles per hour. I had replaced the spark plugs and wires, but this did not solve the problem. I just viewed this video today, and heard your comment about the battery, which i had never heard of before. My battery was 6 1/2 years old, so i took it to a parts store. They tested it and it showed "bad battery - replace", I did, and that fixed it.
Thanks Scotty! - I tried your advice and now my 98 Honda Civic no longer misfires! Thanks again!
This video just saved me hundreds of dollars. my car was having a misfire and so i replaced optispark, wires, and plugs. And it still had a misfire. Watched this video and went down to my auto parts store and had my battery checked and they said it was bad. I put in a new battery and now no more misfires!
Really??
@@powerstuffup I had the same problem, but technically it wasnt the battery. It was the corrosion on the battery wire positive terminal. Scrubbed it down with baking soda and sanded them. everything was good.
Good call on the battery
That was a really great video. How had I never seen this channel before? It was enthusiastic, informative, and didn't waste any time with him trying to do it live and messing up. If inky there were more channels like this on RUclips. You have earned a subscriber today my friend.
you're the man scotty....love the enthusiasm and how you get right to the point!
Hey Scotty this video was very helpful my 99 Pontiac GP started up but stalled immediately my scan tool showed code PO300. I tried to drive it but the brakes were rock hard and had no braking power, Turns out the big vacuum hose on the power brake unit got disconnected somehow. I reconnected it and its fine now
If you wish to ask me car questions, I am switching my questions and answers to my google+ community “Auto Repair With Scotty Kilmer”. So please, if you want your questions answered, go to the google+ community and type my community name in the search and join, it’s free. Once joined, you can ask questions right there.
Scotty, thanks for the work you put into helping people with their car problems!
yes, cheap plastic manifolds often just break apart from engine heat
Thanks for all the great videos Scotty! For my 2005 Chevy Astro, the P0300 code ended up being a bad cap and rotor!
Changed my ignition coil since I was getting P0303 and done. No more car hesitation nor error found, thanks!
Old Schol scotty kilmer!! Wow... 10 years ago, a lot has changed since then! You became quite famous since then , good for you!
I like your upbeat personality scotty. Keep it up! I've never tried anything u suggest but I watch your videos when I'm curious what's wrong with my car before I take it to the mechanic. Anyways, thanks for taking the time to make/upload all these videos
Man, thank you for getting right to the point!!! I'ver learned more watching your short video, than I have from the other 5 that were 10-15 mins long and talked a bunch of gibrish!!!! thank you!!!
swap coil on plug assemblies to see if missmoves. If not, swap injectors to see if they are bad.
Had a misfire p0300 code with poor running car. Car would start but ran poorly. Scotty, you're the only one of 10 other videos I watched, that mentioned bad battery. Got under the hood and noticed corroded pos terminal and the battery was 6 years old. whoa! Replaced battery. Car ran like new, no codes. Scotty, Thanks brother. Love your videos!
With out a doubt #1 of the BEST trouble shooting presenters on the internet. No mindless b.s., needless chatter. Gets right to the point and stays on topic. Also funny and entertaining, who says learning can 't be FUN.
the worst parts is having bad valve or your pistons are the problem, or your chain might slip or your cam position sensor so on and on, alot of things causes missfireing these are the simple ones you check to begin with
Hi veli korkmaz , my Audi A3 8l, 1.6 benzine 2001 misfire on sunny day. Other day , it won’t misfire. Any idea please??
@@elaavgroup2660 not sure why but check the coolant temp sensor
generally the only things that come and go for misfires are electronic problems. Mechanical ones are broken and don't come and go. I would change the spark plug wires if they are old, they often will do that.
bent valves only occur on those if timing belts break and pistons hit the valves. Commonly on those, blowing head gaskets or bad fuel injectors. try swapping those two cylinder injectors with other and PRAY the miss moves, showing bad injectors.
It worked, check battery first showed ok. Check spark plugs and #2 was broken. Car runs great now!
If you like my car help, be sure to watch my live car talk show every saturday morning at 10 AM CST on google events. I answer your car questions LIVE there. Just go to my scotty kilmer channel on youtube saturday morning at 10, and click on the google plus icon on the top right corner. That takes you to the event. You do have to be a member of google plus to ask questions, so join up, it’s all Free.
that's misfire on number 3 cylinder, change spark plug and wire and pray it's that. If not, replace number 3 injector
One thing that was left out is that a random misfire caused by an electrical or computer monitored component will pop a P0300 on you. You will not get that with carbon build up, sludge, worn rings, bad valves or a hole in your piston. The computer "assumes" those variables are in tolerances. Every car inspection should start with the battery then go from there.
How do you fix that?
Exactly! I always say test, test, test! Being a mechanic goes way beyond pulling codes and throwing parts at a problem! Most so called mechanics will pull a p0420 code and immediately go to replace the cat, when it could be a number of things other than the cat, like an o2 sensor. I've seen it so many times I lost count. A shop replace thousand dollar catalytic converter and reset the codes only to have it come back on due to a 60 dollar o2 sensor being the actual problem.
@@justinl9677 mine is the actual cat & other codes come up too… now my car sounds like a freaking v8 when I’m driving or idling my car shakes.. p0300 code has come up and idk if I can even drive it back home like this 😭
try everything in this video, and realize if you have coil on plugs set up, you may have to change all 6 out, they are crap on that model
Good video is there anything else, here is my review 1. Spark plugs 2. Coils ? 3. Vacuum leaks 4. Battery 5. Throttle body ? 6.fuel pressure. 7.
Scotty Your Years of Experience for us is a Gift You've saved us all Thousands or more from being ripped off by The Stealerships
Yes, but generally it's not random then, it would be certain cylinders misfiring and not random ones.
Great video. Always very informative. I have a Chevy Lumina, and was getting the P0300, sometimes P0301 and found I had a blown head gasket at the #1-#3 cylinders. so the heads and gaskets and all intake gaskets, as well as plugs and wires, were replaced. It ran fine all summer. as the weather started to cool, when starting the engine, it starts and runs smoothly, then after a few minutes will start running very rough, even smelling very badly and turning on the check engine light with a P0300. after about ten minutes of driving, it runs great again, nice and smooth, no hesitation and no odor. I am using your techniques today to looks for vacuum leaks. any thoughts?
This guys awesome
If you like my car help, be sure to watch my live car talk show every saturday morning at 10 AM CST on google events. Just go to my scotty kilmer channel on youtube saturday morning at 10, and click on the google plus icon on the top right corner. That takes you to the event where you can ask me questions Live. You do have to be a member of google plus, but that's free and you can just google "join google plus" for that. thanks,
wow tools are so sophisticated now they can remove spark plugs before you put socket in the spark plug mount 0:42
Scitimar 😂
I swear Scotty you saved my life thank you so much
"The dreaded p0300 Cooaaade" 0:17
Random misfire can be more involved but you nailed the most common, good video
1996 Chevy Silverado w/ a 5.0. Just replaced intake gaskets due to LOTS of coolant in oil and got this code after driving it for 2 days. Battery is a month old, cap and rotor button are 3 months old, plugs and wires are about a year old, and fuel filter is maybe 2 years old. Probably fowled plugs due to moisture, correct?
@@daddyosink4413 no incorrect
@@CharlesWilson-oz8ys thanks for the detailed analysis 🤣
What about injectors?
Possible but you would need multiple to fail at once to have multiple misfires
one broken valve spring can cause this p0300, worn ignition coils(s) can cause p0300, also a low idle and lean missfire can cause that, also for that matter excessive carbon build up.
the coil pack should be secured by a fastener. there should be resistance rotating a new coil pack, the old coil pack, might be able to turn. however the coil pack delivers electrical voltage to the spark plug which lights the fire in the engine. the old one might be able to also... ability to rotate isn't really relative to the ability to deliver electrical voltage. i hope that helps
Thanks
11 years later, and this video is still helping people New battery hopefully solved the problem, only 50% of useful battery, never thought of it.
2000 4.3L Silverado 245k miles on it with P0300 errors that had terrible idle, poor acceleration, and several cranks to start. It drove terrible in the city, okay on the highway. Ran vacuum test on the fuel line and it failed (thanks Scotty). Replaced the (newly redesigned) spider-injector, fuel regulator, and all upper intake gaskets. Runs like new. For the mechanically inclined it's about a 3 hour replacement.
When spraying brake cleaner, carb cleaner, etc around the intake manifold, BE CAREFUL to not do it on a hot engine! It's flammable! :)
Nathan Reeves Thanks Good to Know
Not necessarily. Brake/carb cleaner comes in two different formulations. The original was made from chlorofluorocarbons and was not flammable at all. (That was one of the reasons it was so widely used commercially. No chance of fire.) The new formulation is non-chlorinated" and highly flammable.
You should have a proper extinguisher handy just in case
Don’t kick the dog
The battery only has one function, to jolt the starter and start the car. The alternator then takes over and generates power to the rest of the car and recharges the battery small voltage usage. The only time the car runs on the battery is when the alternator is bad and then drains the battery and the car dies on the side of the road. Never heard of a battery causing trouble codes Scotty
If a battery cell starts to go bad and bounces from less than 1 volt to higher than 2.3 volts it will trigger a P0300 code. Seen it many times.
Thanks Scotty, I was worried when this showed up on my 2011 Mazdaspeed 3 today.
What did it turn out to be?
@@babbygee6851 Bad fuel from a gas station I never visited before. When I started refueling from my usual place again the code went away, I didn't have to do any repairs.
Thanks, Scotty! I have a 2002 YukonXL 6.0L V8 that started misfiring a few days ago. I went out and started checking the spark plugs this morning, and then I noticed that one of the coils had somehow come loose from the spark plug. I plugged it back in and started the engine, and it runs fine. That's what I'd call a "stupid" problem, but at the same time, I'm glad it wasn't something really complicated.
I own a 05 Ford Taurus SE with a little over 96,000 miles and I've been trying to find out what's been causing the p0300 and nothing has helped. Did a tune up, changed the fuel filter, both cabin and air filters, cleaned the MAF sensor, checked my plugs that are good, changed the gasket on the intake running valve. * Thank you for showing me how to smoke test a vacuum leak with a cigar, it cleared up the too lean codes I were getting. I still have a slight rough idle. I'm totally lost and can't afford to throw new parts in that aren't the problem. I've got two more weeks to pass smog in California.
Right on man thank you this really helped
glad to hear it, thanks for watching
do my video "what it means when your check engine light is on". There are over 2 thousand different reasons, get it scanned, e mail me the codes for analysis
I wasn't expecting the end lol 😂 🤣😂😂😂
You are a beautiful human being that provides people with basic knowledge (and courage) to work on their cars! Love your vids!
I really like the straightforwardness of the video
am i trippin or did I see this dude just use a socket with a spark plug already in it. 0:42
U did lol
its a demo dude..but good catch.
Damn good catch!
Can someone help me? I had problems with one spark plug wire. I did everything to fix misfire but for now i have feeling that my computer need reset. I remove battery and connect it back after 20minutes. But i think i have the same fuel consumption...
He is just that good😎
Damn, this guy saved me a lot of moo-laa!!!!!!!!
Scotty you gotta repair that house too let me know I have my own construction company and you repair my cars how about that
scotty kilmore must be the king of shade tree mechanics! He is a perfect example of what you dont want to be if you are serious about identifying and fixing problems with cars!
+Michael Hart bud, I have hundreds of thousands of dollars worth of equipment in my garage, BUT I make these vids for DIY guys so I keep it simple in these vids. You don't like em, take a hike, stop whining.
Thanks Scotty. I just changed out my battery on an 08 Hemi and it seems to have taken care of the engine light/ P0300 issue. The battery tests weak under load test but seemed to have no hesitation in starting the engine. Hopefully no more scares for me while driving in Mexico’s badlands. Thanks again.
Did it fix the issue?
I have an 08 impala ss losses power and rough idles in reverse any idea?
Don’t know if you still have the problem, but maybe a bad ignition coil or spark plug. Running rough is a sign of a misfire.
I have an 07 Impala ltz and has lose of power, stuttering and bad idle at red lights and stuff. Changed the spark plugs and wires but still doing it
Antwan Baldwin check your pcv valve and the boot going to it,also clean your throttle body and MAF sensor
my t bird did this and the throttle body was built up with carbon cleaned it and it ran like a champ
Icm
hi scotty i have code p0300 i replace spark plug, and wire and coil i need your advice because I spend over 300 $
+Karam Chato realize P0300 can be caused by over a dozen different things. Now it gets complex and often expensive. Best to have a mechanic at least analyze the other possibilities first
+Karam Chato Cleaning fuel injectors is a cheap step to take to see if the issue goes away, you can have it done professionally for about $100 and because of the system they use to hook directly into the rails you should notice an instant improvement if this was the issue, or you could try a tank additive for $5-$10, pretty much same effect but you will likely have to wait till you go through an entire tank of gas till you see a difference.
What I did first was check for vacuum leaks, I always check the things that are easy and cheap to do
Hello,
I have Toyota Camry 2006 (2.4L)/4Cyl.... it misfires,/loosing power/jerk during running when I increase the Accelerator...... but it remains Lil bit smooth when I increase accelerator very slowly.... No check engine light no any code.
1)..I replaced Fuel filter
2)..Injector cleaned
3).. Air control valve Inspect and clean
4)... Ignition Coil Resistance Check and the resistance is between 349 to 350.7 Ohm for all 4 cylinders ( resistance measured between first 2 pins).
5)... All vacuum pipe also checked but did not found anything..
6).... All electrical fuses are ok
7).... At OBDII no no code display
what would be the cause of misfire or losing power or pick power or jerk....???? Please Rply.
Thanks and regards.
Dildar Hussain.
often a bad maf sensor, check that data first.
Dear Sir,
Thank you so much for your response,
I forgot to Write this step...
First of all i inspect MAF sensor and cleand it with its cleaner and replaced the Air filter also... (Fuel adjustment, PCV and throttle positioning sensor i didnot touch,, Are they related with this problem???)
Can you reffer a Workshop manual or Ebook etc..?
Regards
Dildar Hussain.
Dildar Hussain
I have the same issue, exactly the same, with my 97 Honda CR-V. I did all you have listed and perhaps some other things got anlittle better but then went back to the same or worse as you described and I don't know what else to check or do... Did you figure it out yet? If so, what did you doc any idea? thanks Hussain!
Could be fuel pressure regulator. It really just depends. Best way to nail it most accurately is to get a scanner that can read live data and look at at the fuel trims and all the sensors
Spark plugs. Replace them every 50,000 miles
Thanks Scotty , you really know your stuff and you made it accessible to the lay person.
Thanks Scotty, I also had the dreaded PO300 code,I have a 2000 GMC Jimmy 4X4 with 4.3 , I've had this truck for 5 years now and it has almost put me in the poor house, I've owned 20 different vehicles in my 58 years and have never put so many parts on a truck or car like this, I can't scrap it now I have to much $$$ invested in it. I replaced the spark plugs and wires, that didn't do the trick so I replaced the distributor and rotor with AC Delco parts and that did the trick, she runs like new, thanks for the help.
ok so i fixed two of my issues , oxygen sensors and speed wheel sensors and now the only thing i have left is this multiple misfires so i ll go check battery first and move on the list. THANK YOU SCOTTY AND HAPPY 4TH! GOD BLESS AMERICA
I enjoy how simple and straight forward you communicate Scotty Kilmer. Definitely a helpful vid.
The battery comment was right on! My car had a random rich start (flooding) condition that was severe and mysterious. It disabled the car. Clue was the that stability control light stayed on a 2 sec. longer than it should on those occasions when it did start. Tech was very smart and went to the battery first. Sure enough, that was it!!! Now I watch the batteries very carefully and plan replacement at 3 years unless it's still perfect.
I really like how you explain how to do stuff. You go into enough detail to get the job done. Thanks for all your help
This guy is great! Doesn't beat around the bush...
If you like my car help, be sure to watch my live car talk show every Saturday morning at 10 AM CST on RUclips. I answer your car questions LIVE there. Just check it out at How To Ask A Live Mechanic Car Questions Free On RUclips . And remember, every TUESDAY I upload a new video, so don’t miss them.
I'm not a Scotty kilmer fan BUT I did however find this video to be super helpful
Hey Scotty!! Great videos man... I'm a DIY guy all the way and I always check your stuff first. Got an 03 Taurus reading codes P0316, P1131, P1151, and OF COURSE P0300. Seems to be misfiring at idle and at low rpm's when I hit a hill or whatever. Other than that, no apparent problems such as fuel injectors or vacuum lines. All seems solid, but the check engine light is on and has been on for roughly two days since it started acting up four days ago. Gotta get my MawMaw's car back on the road asap. Many thanks for all your to-the-point tutorials and of course I could really use a heads up or two before I start chasing this dragon if there is one. Keep rockin' man!
start with my other video "fixing a car with multiple trouble codes" and e mail me the first code that comes back
What will a bad battery cause
Scotty... I just watched your video on random misfires P0300 code... Great advice and I have to say... just one video and I'm addicted!! Funny and informative... Keep up the great work
You helped me fix my p0300 on my 99 Tahoe. It turned out to be a dirty fuel filter. Thank you!
can be bad wire or coil on number 2 cylinder, or a bad fuel injector there. Swap #2 with #4 and if miss moves there, replace the injectors.
Scotty, I had one instance where I was coming up with a P0300 code, but it would happen in frequent spurts, usually in rain. I checked everything! Distributor caps, battery, alternator, and even my distributor cap. But when I pulled my distributor cap, there was moisture in it! So I replaced the gasket and the cap, threw in a little dialectric grease, and boom, good as new.
Thats something older people disagree with me on. I have tried over and over to explain to them just cause a battery starts your car does not mean you have a good battery. You battery can start your car okay but, say for example one battery is rated at 650 cold cranking amps and you have a test run on it and the rating comes in probably at 490 or 500 cold cranking amps most likely a tester would deem that as a bad battery or one that is probably getting weak. Glad to see a mechanic who also confirms what I know. Especailly one who has been a mechanic practically his whole life such as Scotty
this is one of the best channels on youtube
Scoty u have no idea how much money u just saved me u r every car owners personnel angel keep up the great work n all the best my man n happy 2015 my friend
considering that over 63 million people have watched my youtube vids, I'd assume I've saved people billions by now. And, If you like my car help, be sure to watch my live car talk show every Saturday morning at 10 AM CST on RUclips. I answer your car questions LIVE there. Just check it out at ruclips.net/video/VognjkYaMjg/видео.html&feature=c4-overview . And remember, every TUESDAY I upload a new video on the scotty kilmer channel on RUclips, ruclips.net/user/scottykilmer , so don’t miss them.
Scotty 99 Nissan maxima 3.0 v6 . Misfire on 3. Swapped 3 and 5 coils to see if it moved to number 5. Cleared the codes . Drove it , now it has the 300 code.
thanks, you explain it much better than most.
A couple months ago I had transmission lurching, engine overheating, and CEL on load only. Called radiator guy. He said I needed a new radiator. Called trans shop, he said it was the torque convertor. Then I saw your vid on misfires. Stayed away from those shops & followed your advice; checked coil packs, plugs & wires. It was # 2 ignition wire. Got a new set of Delphi wires for $29 and all three problems ceased. Thanks, Scotty, for saving me tons of money & aggravation again.
Thefirstgalaxybeing I believe it, if you would of called the plumber he would say you need a new sink etc.
You better know it.
You wanna laugh? You wrote about the plumber a couple days ago and today my daughter called the plumber because she thought the sump pump was going dead. I told her to order one from Amazon for less than $80 and told her I'd tell her how to install it - very simple procedure - 5 minutes start to finish. I live 2000 miles away or I would have done it myself. She instead called the plumber rather than do the job herself and paid him $325. So, if you have any more insights, please make them about me hitting the LOTTO. I'll give you a good cut when it comes in.
Thefirstgalaxybeing if you play lottery you will win, don't forget my cut
You called it Scotty!
I fought with my ‘07 4.7 Jeep Commander over that PO300 code replacing a bunch of parts with no success. That went on for months. Don’t trust the dealership and wanted to beat the problem myself. I didn’t think it could be the battery as it was a Duralast gold only 3 years old. Then we had a no start day on vacation. I got it going and got home but after 4hrs driving the battery was only at 11volts though the alternator was putting out 14.5v. Put in a new battery and guess what? The misfire issue went away ! Hasn’t thrown a code or had a problem since!
How bout that !
The end in the truck lol 😂 Gotta love Scotty!
Tahoe 2005 random misfire hoping I can get this fixed before Monday love you Scotty
Scotty u are awesome as hell bro, my 98 Park Avenue was already giving me the P0306 code so I knew it was a misfire from my 6th cylinder, then it cut off last night, got it towed and the P0300 code is now showing, I'll work on it tomorrow, thank you bro.
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many things can cause that no start and misfire, BUT put a new crank sensor on first cause if it goes bad the ignition can be retarded too far to stay running. Pray it's that easy of a fix.
Your energy is on point