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Message: <blockquote data-quote="Scott Schaeffler" data-source="post: 1048514" data-attributes="member: 72709"><p>Another thought.  Look inside the throttle body (the IAC is attached to the top of it) and look at the input from the EGR valve.  It's on the right side of the throttle body as you are looking into the throttle body.  Might need a dentist mirror to look in the EGR valve input as it is curved into the throat of the throttle body.  Anyway, mine was encrusted with a lot of carbon buildup that would cause intermittent rough idling (almost stalling).  I cleared it out and it has been running smooth ever since.  Good Luck.</p></blockquote><p></p>