The ISC valve could be a problem, although when they go bad they usually give you a low or no idle problem, especially when cold. Make sure you don't have any vacuum leaks. Check for cracks or breaks in the vacuum lines and the air intake tube. Also check the PCV valve-it should rattle when shaken. Its possible it might raise the idle if it were stuck open. Also check the throttle cable for free and smooth operation.
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Tuesday, December 23rd, 2008 AT 9:48 PM