rpms jump up and down
35

Asked by Mike Jul 23, 2010 at 04:29 PM about the Pontiac Grand Am

Question type: Maintenance & Repair

when my car idles the rpms go down and back up and you can feel it and its worse when the a/c is on is that the altantor or a misfire?

1 Answer
21,205

Michael answered 13 years ago

What you are describing is a tell tale sign of the IAC (Idle/Air Control) valve going bad..

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