IDLE BOUNCE on 2005 Chevrolet Cobalt SS

When driving my car (with the AC on)i notice when coming to a stop with the clutch in and it idles down, it bounces. Almost to where it stalls. It doesn't do it with the AC off. And it will not bounce when it idles unless you give it gas and let it idle down with the clutch in.

by in West Milford, NJ on August 31, 2010
2 answers 5 comments
ANSWER by on August 31, 2010
Hi, When was the last time a tune up was done and how many miles are on the car?
COMMENT by on September 01, 2010
Haven't done one yet and i have 60.000
COMMENT by on January 17, 2011
HI,carbon build up is a common problem. Remove the throttle body and clean with soap/water mixture and air hose should do the trick. GL Ted
ANSWER by on September 13, 2010
hey 2007 Cobalt SS/SC here 76000 miles car is well taken care of and in excellent condition, mine does the same when A/C on, its normal b/c the a/c puts strain on the engine and the computer is making up for the loss of power
COMMENT by on September 13, 2010
But mine almost stalls sometimes. Some one told me to clean out the throttle body because the plate gets build up on it. I'm going to take it apart and spray the plate down with throttle body cleaner and see what happens. Thanks for the feed back.
COMMENT by on January 15, 2011
remove the throttle body and clean with carb clearner.. its very simple four bolts and about fifteen minutes and your done....then she'll run sweet!
COMMENT by on January 15, 2011
Thanks for your reply. But i have heard stories about using carb cleaner on it being too harsh for the throttle body. That there is a coating on the body it's self to keep the carbon from collecting and by using cab cleaner it takes that coating off.