2000 Grand prix throttle problem, transmission?

My cars throttle while being constant fluxuates when shifting low gears, any idea was it is?

[@PostMasterDRich83]

I am having the same problem as well. I am planning on changing the throttle position sensor tomorrow since it is cheap and easy. I will try to remember to post here as to whether it worked or not.

[@e60Theooooo]

Did it work

[@dvbeuro]

I have a custom ECU which when combined with my rebuilt transmission made the shifts too soft. When I had the transmission rebuilt they tuned it too hard which conflicted with the software tune.

[@joe0813]

could be a bunch of things..... TPS, MAF, Trans (which would suck) Id start by checking the voltages at the sensors

[@MichaelKirbyMusic86]

same problem, 00 n/a - cleaned maf, new air filter, fuel filter, plugs/wires..didn't solve it

[@evan4607]

I'm having the same problem with my Grand Prix, and I have no clue either.

[@metalgtp]

Check the Throttle position sensor

[@joeyortiz13]

almost same problem im at 4000 RPM at 55MPH no check engine light no leaks shifting jerks once in awhile runs smooth WHATS GOING ON ANY THOUGHTS ??????

[@AJ-bi2rt]

I believe mas flow sensor problem. Good luck

[@MrsLaurensLife]

transmission is slipping in and out of gear

[@david0001car]

mine does the same shit. but only in the morning. after it warms up its fine.

[@joshsmith7469]

i had the same issue just replace throttle body and drive over 45mph for about 15min and u should be good

[@brianbrinker8780]

Definitely transmission

[@rawshores]

anybody knows why this happens? mines sometimes does the same thing.