NISSAN SENTRA STALLING DURING IDLE DIAGNOSIS AND FIX

Поделиться
HTML-код
  • Опубликовано: 28 ноя 2024

Комментарии • 358

  • @beethao9380
    @beethao9380 4 месяца назад +2

    This just happened to me at similar mileages. I'm on my last leg. No job, no money, just got done with an interview that is a strong possibility. Then my car dies. Now its back up. Just cleaned the throttle body and now its working. Thanks a ton. I owe you.

  • @MyCooley123
    @MyCooley123 2 года назад +13

    I have been doing this for 45 year`s it is good to know there are still guy`s like your self who are honest.Keep up the good work.

  • @edgrr01
    @edgrr01 2 года назад +26

    you seem like an honest and problem solving mechanic I like that and we need more mechanics like you and not the ones who just assume and change parts without getting the problem fixed

  • @milanobus
    @milanobus 3 года назад +3

    I'm not even a mechanic, I just enjoy watching you problem solve.

  • @bruno2566
    @bruno2566 3 года назад +8

    My 2011 Altima had the same problem with the same code. After 2 visits to the dealership, they couldn't fix it. I cleaned the throttle body and it's fix!!! Thank you so much Eric. Keep up the good work!!!

  • @michaelherbert8213
    @michaelherbert8213 5 лет назад +34

    Please stop apologizing. Your content is great. Thanks for sharing.

  • @hectorfmaldonado5875
    @hectorfmaldonado5875 5 лет назад +8

    In a word: you do a conscious repair. It seems like you can sense the vitals in the engine, and from there your approach ends in a definitive fix. Congrats my friend.

  • @FM-wh8uc
    @FM-wh8uc 8 месяцев назад +1

    THANK YOU FOR SHARING YOUR DIAGNOSTIC KNOWLEDGE SALUDOS DESDI GUAM USA

  • @Walksomemore
    @Walksomemore 2 года назад

    You are without a doubt the best troubleshooting/maintenance site out there! No frills, highly competent, and you don't waste time in shameless self-promotion -- You don't need to self-promote, your work and presentations skills speak for themselves - Awesome!!!

  • @robertanderson6850
    @robertanderson6850 5 лет назад +8

    I enjoy your diagnosis process. I just got a new Autel scanner . So your use of it will help me see all that it can do. Your approach really makes me think that codes can lead you to testing and not jumping to conclusions too quickly. Thanks so much for your abilities and great explanations !!!

  • @robertoruiz7069
    @robertoruiz7069 5 лет назад +3

    One of the best videos out there,most mechanics would have replaced the sensor, then put in a air filter,then a fuel filter,then a fuel pump.After that didn't work they would check the coils,the distributor ,then change the oil and filter.then change the catalytic converter,and finally the muffler and TELL THE CUSTOMER >>>>IT" MUST BE THE MUFFLER BEARINGS that's the ONLY thing left, but the parts dept is out of them right now,we had a lot of these models come in lately just like yours.

  • @justsumguy2u
    @justsumguy2u 5 лет назад +34

    Nice job of investigating. Most shops would've just thrown a new MAP sensor at it (at the customer's expense) and hoped for the best

  • @georgegerhardt7048
    @georgegerhardt7048 5 лет назад +6

    Best engine tech I have ever seen I been around cars fore over 50 years

  • @maxbiz1114
    @maxbiz1114 4 года назад +4

    Great job explaining the problem and taking us through the details of MAF sensor, throttle body cleaning, checking and resetting codes. Also, please explain how to reset codes after the job is done in a keyed-ignition so that it covers all models. Thanks much for saving a whole bunch of money and learning a new skill. Keep it coming!!

  • @blerpblorp2118
    @blerpblorp2118 4 года назад +2

    Had my MAF and camshaft position sensor replaced on my 02 (2.5L), was not the issue, a lot of labor and parts in cost, the issue has returned. I personally am thinking more towards throttle body. This video is a very great perspective for this repair process regardless of year. It defines a simple code that is in relation to another component. Specifically related to Nissan vehicles, the code does not source the actual component issue. Great video.

  • @aceindaplace8609
    @aceindaplace8609 3 года назад +2

    This is prob the most informative video I've seen in a good while just shows skills over just going by the codes that are thrown by the scanner.

  • @unclemarksdiyauto
    @unclemarksdiyauto 5 лет назад +72

    In this case "SR" stands for stalls regularly!

  • @zoubirbelaribi77
    @zoubirbelaribi77 3 года назад +9

    Man you just saved me some time and money today, I had the same exact issue in a 2016 Versa. BIG Thank you!!

    • @gloriawright8646
      @gloriawright8646 3 года назад

      Nissan Sentra 2019 park over night or for few hrs want start up get someone give me a charge someone please help

  • @enriquecontreras3720
    @enriquecontreras3720 2 года назад +3

    You’re the man! Got my car back , running. 🙌🏽

  • @ME-kv8ew
    @ME-kv8ew 5 лет назад +10

    Thank you. I have a 2011 Altima that started throwing this code. I have cleaned sensor best I can. Changed air filter. Still get it. Comes and goes. Idle seems funny during slow movement as well. I will clean the throttle area as you did. Again, thank you.

    • @scientist100
      @scientist100 4 года назад

      These types of sensors cannot be cleaned unfortunately as the sensor itself is barried inside the enclosure box, what you see on the outside is the temperature sensor.

  • @syken8695
    @syken8695 Год назад

    I have a sentra too. My issue with stalling came with a bad PCV valve. It was exactly the same issue. Vehicle would start and then shut off. No amount of cleaning the throttle body fixed the issue, even replacing camshaft and crankshaft sensors didn’t work. Replaced the MAF sensor too, still did the same thing - kept stalling. It’s the PCV valve, that’s your fix. Cleaning the throttle body is a temporary fix, you need a permanent fix. I am the owner of 2014 sentra, this car has put me through a wringer with its issues. The only easy part is that it’s cheaper to fix, never mind the other more expensive cars. I maintain it as much as I can, my wallet is almost empty, but it’s still breaking. I don’t know what is the problem, but I might have to dump it to scrap heap if this continues. The good news are is that it’s not burning oil currently, so I am good, at least for now. Will see what happens in the next 50000 miles.

  • @chriswagner4470
    @chriswagner4470 4 года назад +4

    I do a lot of repairs and this was the best video and explanation I have found. Good job!!!

  • @redstormpopcorn
    @redstormpopcorn Год назад

    Thank you for being literally the only person to put up diag/fix documentation using a push-button ignition on the demo vehicle :V

  • @georgegerhardt7048
    @georgegerhardt7048 5 лет назад +6

    Best engine tech I have ever seen

  • @Chief_5
    @Chief_5 3 года назад +2

    Cars are so fragile now.😟 great video.👍👍

  • @danielmckenzie6858
    @danielmckenzie6858 5 лет назад +3

    I WAS IMPRESSED WITH YOUR SKILLS AND I LEARN SOMETHING AT THE SAME TIME

  • @PineHollowAutoDiagnostics
    @PineHollowAutoDiagnostics 5 лет назад +4

    Sweet diag and fix, Eric! No parts required FTW :)

  • @bekomcar554
    @bekomcar554 9 месяцев назад

    This reminds me of GS430 case, Air does matter in drivability. Thank you for sharing your insights.

  • @thejflores1219
    @thejflores1219 5 лет назад +12

    Those sentras idle relativity high until it reaches temperature.

  • @5477harry
    @5477harry 4 года назад +3

    The funny thing is the possible causes for the code on the website didnt include dirty throttle body lol good video

  • @tracysmith6757
    @tracysmith6757 2 года назад

    I have a much better appreciation for diagnosis steps. Good job!

  • @rafaelmondragon4476
    @rafaelmondragon4476 4 года назад

    Thumbs up Advanced 👍 with so many mechanics out there ripping people off. It's good to see there are honest ones out there as well.

  • @martinezfamilyhomestead
    @martinezfamilyhomestead 3 года назад

    Just wanna say thank you for this video I have the same car my car wouldn’t stay on at all I did what you did and now my car runs and stays on so thank you

  • @MyTerryb
    @MyTerryb 5 лет назад

    GREAT VIDEO.. I WORKED ON A NISSAN ALTIMA 2016 52,000 MILES WITH THE EXACT SAME PROBLEM ... BUT IT WAS THE MAF PROBLEM, CLEAN MAF WITH CRC MAF CLEANER AND BLOW DRY WITH COMPRESS AIR. AND I ALSO CLEAN THE AIR THROTTLE PLATE. ( BUTTERFLY) RELEARN CAME BACK TO IDLE SPEED AFTER DRIVEN ABOUT 25 MILES ON THE HIGHWAY. THANKS

  • @spelunkerd
    @spelunkerd 5 лет назад +5

    I'm surprised this turned out the way it did. When you booted the scan tool I was wondering about IAC counts and fuel trim, speculating that a vac leak was causing too lean a mixture when at idle, pushing IAC closed (if it has one). If air bypasses the MAF it would underestimate the volume of air and offer less fuel, improving when air flow increases with WOT. I suppose it might also cause MAF reading below range. I was wrong, presumably the lean mixture of a vac leak would throw a lean code as well. Maybe the dirty throttle body didn't let air down the IAC passageway so the IAC couldn't compensate enough to maintain idle.

    • @ADVANCEDLEVELAUTO
      @ADVANCEDLEVELAUTO  5 лет назад +8

      This vehicle doesn't have an iac. The electronic throttle body allows a minimum amount of air flow during idle. But when it gets dirty enough, air can not flow to keep the engine running. Thanks for watching!

    • @christophervanzetta
      @christophervanzetta 5 лет назад +1

      @@ADVANCEDLEVELAUTO and as a safety feature, it shuts the engine off to prevent flooding

  • @HarryWangHungLo
    @HarryWangHungLo 4 года назад +1

    Thank you for this! Man, I want YOU as my local mechanic!!!

  • @risingoneagleswings1776
    @risingoneagleswings1776 2 года назад +3

    Very clear and precise video. Mine is rough idle while stopped. Jumping from 650 back to 500 then back. Consistently. No check engine light. No codes. Also having an issue starting only after it's been off for a few hours. Cleaned the Mass Air Flow Sensor. Cleaned throttle body. Any ideas? Thank you!

    • @BillSW
      @BillSW 2 года назад +1

      did u solve it?

    • @risingoneagleswings1776
      @risingoneagleswings1776 2 года назад

      @@BillSW Nope. So far have changed, plugs, coil packs, camshaft sensor, crankshaft sensor,. Ran sea foam fuel injector and fuel system cleaner through it. I can tell you that it's slowly getting worse. Sometimes when it starts now it sounds like it's starving for fuel but it always does start. And no problems driving once it starts. Fuel economy is good pick up is good. I can also smell fuel after it starts. Seems to be pointing to possibly one or two bad fuel injectors. The car is just not getting the fuel and needs to start up right away. Of course if they were faulty fuel injectors I would notice it in the performance.

    • @risingoneagleswings1776
      @risingoneagleswings1776 2 года назад

      Since it only gives me trouble starting when the car is cooling down it says something to me about a temperature sensor. Possibly the fuel temperature sensor. Who knows at this point. I'm not even sure if the rough idle and the delayed start is even connected.

  • @luisbarajas7931
    @luisbarajas7931 3 года назад +1

    Thank you so much your video helped me a lot I have a 2000 Nissan Sentra SE 2.0 and I was having the same problem I cleaned it did the one two step 10 second step and I work thank you so much 👌👍👍🙏🙏🙏

  • @johnny2tone1
    @johnny2tone1 3 года назад

    Man, your freaking diagnostic wizard

  • @odishoodisho4904
    @odishoodisho4904 5 лет назад +2

    Thanks for the great video . Congratulations for 10000 subscribers

  • @orville58
    @orville58 5 лет назад

    Way to not getting sidetracked with the mass code knowledge is the key

  • @richardmwale7772
    @richardmwale7772 3 года назад

    U r a greatest auto technician..

  • @orinmangar2333
    @orinmangar2333 4 года назад

    THis is a constructive comment. One of the fixes is to check the air filter. I did not see you do that. Also the vehicle has over 91,000 miles. It was due for a throttle body cleaning! All said you did not throw parts at it. Good Job.

  • @jnorman1511
    @jnorman1511 4 года назад +3

    You're doing a great job, man. Love your videos!

  • @jonathanamos4415
    @jonathanamos4415 2 года назад +1

    i think there is a bulletin now for pcv valve to be changed as well

  • @mhicford55
    @mhicford55 3 года назад

    nice step-by-step instruction..i am having the same problem with my 2.5 SL 2014 altima. i will be doing the same thing once my new scanner arrive

  • @spacescience100
    @spacescience100 Год назад

    Can you make a video on how to read the technical bulletin and for example if it was P0101 and the car was driving fine, what would be the next strategic repair/diagnostic based on the technical bulletin? Thank you!

  • @lataragraham668
    @lataragraham668 2 года назад +1

    Key information for me. because I'm experience the same problems.

  • @descendants3vkday230
    @descendants3vkday230 4 года назад +3

    did the same repair. Got a new Mass sensor, new air filter, cleaned throttle and reprogramed it, the car feels better but i can still feel its missing power. Sometimes when i acelarate a little misfire shaking happens. but my sparks plugs and coils are new. Its driving me crazy because i cant solve this problem. Any more suggestions amigo?????

    • @Westzebo
      @Westzebo Год назад +2

      Did you ever find out what happened? Same issue nowadays but losing traction control too

  • @carsonkirkconnell1979
    @carsonkirkconnell1979 4 года назад +2

    Glad I could find your video, instant follower. Question for you: Do you think that this gunk you cleaned in the throttle was due to a design flaw of the EGR system? I read somewhere that this engine recirculates a small portion of the exhaust back into the manifold, and the input his is right after the MAF. Any thoughts? Should Al Sentra have this cleanse as a preventative maintenance?

  • @hightttech
    @hightttech 3 года назад

    Very nice. You are correct in that majority of shops would have replaced MAF sensor. Would you say that this vehicle must have been running poorly for a while, and the inability to idle was last straw?

  • @F142Lock
    @F142Lock 4 года назад +3

    Greatings feom Miami.thanks brother ,good info on the stupid Sentras 👍

  • @buildstoys
    @buildstoys 5 лет назад +3

    Thanks for another great walk through. Also, that's a great idea including the "reference screen" at the end -- is there a forum or website that has that type of info freely available?

  • @montehammons7917
    @montehammons7917 5 лет назад +1

    Good video, nice work. Stop apologizing-workplace noise is okay, like background music, it's okay. Also put the explanation about no IAC valve on this model in your video. Good information to know and pass along. All around good video, cheers.

  • @MrBuddysAdventures
    @MrBuddysAdventures 5 лет назад

    Just found/subscribed to your channel a couple of days ago and been binge watching your videos. I really like your down to earth attitude and the fact that your videos aren't too long going on and on into multiple parts nor are just 2 mins long with super fast talking LOL
    My only minor suggestion would be to turn the background music down it's more distracting than the impact wrench :) Great content!

  • @mikeodell5915
    @mikeodell5915 3 года назад +2

    Im chasing a no start on a 2002 Nissan Sentra gxe no start unless i plug a OBDII in ...then it will start and run

  • @jomartin3864
    @jomartin3864 Год назад

    soda stereo in the background 👍 great video!

  • @Jonathan562213
    @Jonathan562213 4 года назад +1

    Does the 2015 nissan sentra 1.8 have an Idle air control valve i cant find it thx

  • @williammize8270
    @williammize8270 2 года назад +2

    Got 02 Sentra 1.8 cuts out bucks stalled one time start right back up

  • @nicholaspaul2458
    @nicholaspaul2458 5 лет назад

    Great job. I like the methodological approach to the problem.

  • @on-site4094
    @on-site4094 5 лет назад +1

    Great diagnostic and great great problem solving skills 👍

  • @mikesmith7871
    @mikesmith7871 4 года назад +1

    Thanks you for you video. I went rivht outside and did exactly what you did and it work. I just couldnt clear the engine light because i dont have a reader. But good job.

  • @hiphopwasreborn5628
    @hiphopwasreborn5628 4 года назад

    I have a 2015 Nissan Versa doing the same thing! This was a great video thank you sir

  • @billyyoder8171
    @billyyoder8171 5 лет назад +1

    Thank you Eric. Good job. You're a great technician brother. I appreciate your videos. Have a blessed and safe week.

  • @billjack5394
    @billjack5394 3 года назад

    Thank you for the great video. So, which was the most effective fix, the 3X relearn procedure on the throttle body or actually cleaning the throttle nozzle itself?

  • @wilfredocayacap9412
    @wilfredocayacap9412 2 года назад

    Good luck,ur tutorial is clear
    God bless my friend I'm always
    Watching u by the way Sir, I would
    like to ask,my car 6cyl rpm not mo
    ving n stalling.
    of my car 6 clyde rpm stalling n
    RPM not work,

  • @tonydavila2606
    @tonydavila2606 4 года назад +1

    You can unplug it and run it without the sensor and if it’ll run without it. It’s on a open loop at start and doesn’t need sensor Input.

  • @salvadoralvarez2093
    @salvadoralvarez2093 Месяц назад

    Friend ayuda ya puse 2 maf air flow sensor solo se va por DOS a 3 dias i vuelve El. Codigo?

  • @THEDRAGONBOOSTER8
    @THEDRAGONBOOSTER8 5 лет назад +2

    Now to finish he needs a air cleaner blow out and a wipe out etc .Well done.

  • @sergiolopez5652
    @sergiolopez5652 4 года назад

    I have a same sentra and make the same thing. And cant find the problem. And with ur video i fix it tanks bro keep up with viedos

    • @jtmt8619
      @jtmt8619 4 года назад

      How much it cost to fix the problem ? I have the same problem . And I dont want to be overcharged.

    • @sergiolopez5652
      @sergiolopez5652 4 года назад

      Just clean ur self the Throttle body with spray

  • @MiguelFlores-jp1ss
    @MiguelFlores-jp1ss 5 лет назад

    Just subscribed!! Good video, easy to understand!! The reference info at the end is PRICELESS. That range info (for me ) is hard to find and is needed to properly diagnose, THANKS !!!

  • @DJCARBON2012
    @DJCARBON2012 5 лет назад

    I have an 05 trailblazer 4.2 I6, battery died and replaced it, then started having this same issue where it would stall out during idle and had to keep my foot on the gas to avoid this happening. A bit of throttle body cleaner did the trick, then reset the learn procedure and your good to go.

  • @anthonysova7117
    @anthonysova7117 5 лет назад +7

    Would idle come back after driving the vehicle ?

  • @jeffcompton6937
    @jeffcompton6937 Год назад

    So tip for next time. If you leave the shifter in drive with the key on engine off and hold the gas pedal open to wot with a long prybar etc you won't need to push on the throttle blade and possibly damage the gears in the throttle.

  • @joshuaavila8317
    @joshuaavila8317 Год назад +1

    What scanner is that

  • @reweydewy
    @reweydewy 5 лет назад

    I just had a 2014 nissan versa with the p0101. Fuel trims were pegged rich and car would barely idle. Most times it would start and stall. Mass air sensor was replaced by the customer but same issue. Cleaned the throttle body and car ran perfect

  • @Prowler414
    @Prowler414 Год назад

    Could I relate to this Video if my 2017 Nissan Altima SR is stuck at 1 RPM? Car goes no higher than 45 MPH but RPMs go really high on the accelerator press.

  • @VRose-ig4qj
    @VRose-ig4qj 4 года назад +5

    Bro this is exactly what happened to me, "Mass Airflow Code" ended up being the throttle body.

    • @CraigPetty555
      @CraigPetty555 3 года назад +1

      Same here, I have a 14 sentra sr

  • @kyhomegarage3430
    @kyhomegarage3430 5 лет назад

    Excellent case study my friend. I need to do this on my daughters Nissan👍👍😁

  • @starkey0417
    @starkey0417 2 года назад

    Awesome video! Having this problem with my wifes 2014 Sentra. I'm afraid to try the throttle body by myself without the program. Is it something I can do if I follow the 2 second, 10 second deal?

  • @johnkendall9831
    @johnkendall9831 5 лет назад

    Beautiful job,you definitely are special, my wife calls you the " Car Whisperer "..

  • @ferberb9662
    @ferberb9662 5 лет назад

    A nice video very informative I have a 2014 Sentra with the 1.8 to now I know if this code comes and I take it to the dealership or a regular mechanic I can ask questions on the problem and how they fix it and se if they are over charging and another thing can you tell me the brand and model of your scan tool it will be nice to buy one or what other you recommend

  • @frankbuben5172
    @frankbuben5172 5 лет назад +3

    Good video I like the long screw driver lol

  • @johnavila7942
    @johnavila7942 2 года назад

    Eric can do a video on the tsb for the non drivability issue. Thanks

  • @awongutume
    @awongutume 4 года назад

    SR in Nissans are Sportier Ride with better upgrades. Any reason you did not use carburetor cleaner spray?

  • @Ottonic6
    @Ottonic6 5 лет назад

    Another good one. Love your work... Only question. With a throttle body so gummed up that the engine stalls, why not remove it and give it a thorough cleaning?

  • @kenotbee
    @kenotbee 3 года назад

    I have a 2014 sentra, not with a push button start. Can I do the same idle releaern procedure you did?

  • @rondail5675
    @rondail5675 5 лет назад

    Why didn't you spray Carb-Cleaner or MAF Cleaner into the throttle body?????
    Thanks for sharing!!

  • @gianfrancoa
    @gianfrancoa 5 лет назад +4

    The best part of the video was the background music, LA Ciudad de la Furia

    • @christopheraldana7271
      @christopheraldana7271 5 лет назад +1

      gianfrancoa thanks I try to play good music while working in the shop

  • @bobbyshrout6971
    @bobbyshrout6971 5 лет назад +3

    Where did you receive your training? I am very impressed and enjoy watching your problem solving skills!

    • @ADVANCEDLEVELAUTO
      @ADVANCEDLEVELAUTO  5 лет назад +7

      Mostly self taught. Books and lectures and hands on experience. Thank you for watching!

    • @sammybirech5211
      @sammybirech5211 4 года назад

      @@ADVANCEDLEVELAUTO which book do you think can help me

  • @DylanRabier
    @DylanRabier 5 лет назад +2

    Great video. Good info Eric. Thanks for sharing! 👍

  • @BABYGODZILLA2009
    @BABYGODZILLA2009 3 года назад

    Hi Eric, very nice video. Thank you. Just have one question, I have a 2015 Suzuki Alto RS Turbo with drive-by-wire throttle system. I have this idea to remove all the pipes of the throttle and clean the butterfly thingy with carb cleaner. If I do that, do I have to connect a scan tool and do that re-learn value thing? I got abit scared when i saw this video since i do not have a scan tool. Please advise.

  • @bobbycastor7329
    @bobbycastor7329 2 года назад

    I have a 2021 Nissan Sentra. When I park my car and have not shut the engine off. If i run it in park for an hour so I can run my a/c. I’ll get a system malfunction displaying on the dash. I’ll then put the car in drive. It will shake and then stalls. One time I couldn’t start my car with the push to start. I had to use the start option on my key fob. Help. What is going on? Only has 30k miles

  • @dharshanaw5926
    @dharshanaw5926 5 лет назад +1

    Can you Pls let me know the exact model of the Diagnostics box that you use , and how you procured the unit and how much it costs?
    I am from South East Asia ( Sri Lanka) and do not have direct access to such advanced technologies. However we have all the latest Japanese, and European cars on our roads, resulting in a massive technological gap in maintaining these automobiles to be road-worthy over time.
    Cheers!

  • @jamesnobles7798
    @jamesnobles7798 2 года назад

    What kind of cleaner did you use for the throttle body?

  • @boystoyz8922
    @boystoyz8922 5 месяцев назад

    Man, great video, brother. Subbed.

  • @68hoffman
    @68hoffman 2 года назад

    what was the charge for that service ...i got a 2002 se-r 2,5l 4cyl and i changed the mass air flow sensor just to improve the drive ..the service soon light came on ..it has not re set on it's own ..the idle runs up and down to a near stall ..i have not touched the throttle body ..and it ran ok before but this fix has not worked for me ..ummm when i clear the code will it make the car idle safe again ..btw ..the car drives and idels fine in gear ..but it's in a limp home mode i think ..will i need to reset the throttle body just to replace the maf sensor ..idk ..can i put the old one back ..will it idle the same with that or have i done something else ..lol..

  • @TenB33rs
    @TenB33rs 4 года назад

    After seeing that air box loose like that i thought for sure un-metered air was causing that... Guess not... Im surprised though a dirty TB would just all of a sudden cause a super low/ no idle condition. That TB looked pretty good in the mirror... Looks like a fix though... good job not firing the old parts cannon!

  • @davidnelson5900
    @davidnelson5900 2 года назад

    Hi buddy what diagnostic tool are you using

  • @BudgetClan
    @BudgetClan 3 года назад

    Hell bro.. my nissan idle is perfect but when i hit the gas the idle goes up and down... i replaced mass air flow sebsor... but nothing.. please help!