Hi:
It sounds like a problem with the IAC or TPS. However, that is a guess without having the computer scanned for codes. Most nationally recognized parts stores will do it for free, so I suggest having it done.
Also, make sure there are no major vacuum leaks under the hood. Listen for hissing sounds.
Let me know what you find.
Joe
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Thursday, January 15th, 2009 AT 3:40 PM