Hi:
Has the check engine light ever come on? If so, have it scanned at a nationally recognized parts store. Most will do it for free, and it will help identify the problem.
Also, to me it sounds like a throttle position sensor (TPS) or an idle air control valve (IAC).
Have it scanned and let me know what you find.
Joe
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Thursday, February 19th, 2009 AT 4:20 PM