I would first remove the EGR valve and make sure it is not stuck open with carbon or something. Then check for any vacuum leaks.
When all those issues are resolved, clean the throttle body.
Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle.
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Thursday, September 30th, 2010 AT 10:36 AM