Before doing anything else, remove the EGR valve and inspect it to verify that it is closing all the way and doesn't have any carbon chunks caught in it.
You may have a bad IAC ( idle air control) but try cleaning the throttle body first. 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. If it still has a problem, replace the IAC.
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Thursday, September 23rd, 2010 AT 9:05 AM