I have a 2005 chevy cobalt and when i stop the rpms drop to 500 and back to 1000 yet they say it is fine?

Question:
i brought the vehicle to a dealer and they performed an update for the ecm due to other vehicles having the problem. didnt really do any good. anybody else have this problem?

Answers:

I have atruck that has s10 durango emblam onit . is there a 1988 chevy s10- durango pickup truck ever made?

try letting it idle for 15 or 20 minutes one morning(even better if its cold out) and then shut it off turn it back on. That might give the computer time to adjust it self. if not you might have a problem with the computer or spark plugs?(how old r they); bad injector failing at low rpm? those would be my first of things to check. Good Luck!

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