Has anybody had any issues with the engine rpm fluctuating while the car is rolling while in neutral or with it in gear but you have the clutch engaged ?

When i came to a stop with it in neutral or clutch engaged the rpm fluctuate and sometimes the car stalls on me. It has done it from day one, but has become more frequent over time.
I have had it at the dealer 3 x, but no engine codes come up and have had the computer re flashed twice.

It only does while the car is rolling, not when i have come to a complete stop, and the car has to be in neutral for it to do it, not while the engine is under load.

Other then that the car runs great !

 

If the reflash didnt fix it(There is a tsb out on that which says to reprogram the pcm)
Then I would tend to think there is a sensor problem(wheel speed sensor)One of them maybe putting out irregular signals and confusing the pcm causing the irregular idle,
I know are cars hold the idle up until you come almost to a complete stop and then drops to idle rpm
so that would make me think that the wheel sensor might be buggered.
I would recommend that you tell the dealer to call someone in that specializes in trouble shooting these problem because you want it fixed once and for all.

another question ,does it do with the air con off,remember the air con is on if you have it in defrost and not if you have it on floor only.

 

it doesn't matter,

i have brought it to 3 different shops, one told me it might be a bad computer and the other said it might be the mass air flow sensor...

the car is now past its warranty now

 

i think i read somewhere about someone having this problem and they cleaned there throttle body and it stopped having this problem ill c if i can find the thread

https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/idle-problem-cure-finally-116051/ <<<read this see if its the same problem

 

that is my exact problem, i`am going to give it a shot !

Thx

 

yeh i thought it sounded familiar hope it works for u

 

just did it today, FIXED

 

Mine is doing the same thing! Except it only does it while sitting still and the first time it did it all the info stuff reset itself. I was told to clean the throttle body and check for dirt( doing it in the morning) but what does that have to do with everything resetting? ECM prob maybe ya think?