1QWKZ

Mine is doing the same thing - try turning off the AC and see if it still does it.

i am not a mechanic but i have had this issue,
is it stock? this is what i had to deal with after it was tuned on a dynojet with efi live.If the air box is different it my need re-calibration?
mike

i am not a mechanic but i have had this issue,
is it stock? this is what i had to deal with after it was tuned on a dynojet with efi live.If the air box is different it my need re-calibration? Charley Williams is in your back yard and will fix it.Call him.
mike

my 99 would do that with no other drive ability problems........busted ring landing cyl #4

It's a sensor I foret what it's called I fixed mine on the throttle body it's a GM part

I had a similar story on my A4 1.8T - at traffic lights the revs were jumping up and down, sometimes the car almost stopped. In my case, the culprit was a dirty throttle and an old vacuum tube that started sucking air. After cleaning the throttle and replacing PayDaySay the hose everything became stable. I suggest you start simple - inspect for air sucking and clean. Good luck!

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