Chances are it's a problem with either the idle air control valve (IAC), or the throttle position sensor (TPS). However, this is a guess. What I recommend it to take the car to a nationally recognized parts store and have them scan it for trouble codes. Most stores will do it for free and it will help identify the problem.
Let me know what you find.
Friday, January 16th, 2009 AT 1:17 PM