neohic Posted June 5, 2011 Share Posted June 5, 2011 My friend has an '87 XJ, 4.0L, auto., and it idles right around 1200 RPM. He's changed the IAC about a year ago, TPS recently, coolant sensor, intake and exhaust manifold gaskets, and checked over all of the vacuum lines. The problem gets a little worse when it's at running temp. Any ideas from the pros? Thanks, dudes! Link to comment Share on other sites More sharing options...
philbert001 Posted June 5, 2011 Share Posted June 5, 2011 I would say triple check those vacuum lines. That'll mess with idle! Link to comment Share on other sites More sharing options...
neohic Posted June 6, 2011 Author Share Posted June 6, 2011 Hmm... so, on his '87, there is a screw on the side of the throttle body that is right above the EGR. On my '88, it is plugged with a rivet. It came down to it that the screw was backed out slightly and he tightened it back in... fixed the problem. :dunno: Link to comment Share on other sites More sharing options...
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