My 89 XJ with a 4.0L will not idle right. Replaced IAC, but when I start it RPM's will shoot up to around 2000. Does not do it all the time. Can IAC be adjusted? Any other suggestions? Very angering!!!
It probably is the TPS but I had the same problem on a Subaru I have. It was the "throttle kick" from the AC. I had disconnected the AC compressor for winter to keep it from coming on and it thew the computer into a frenzy. In park and Neutral it would rev to about 2500 to 3000 RPM's. It's a long shot but another route you can look at.
I did find a vacume problem on the t-body. As you face the engine on the left side of the t-body there are 2 v-lines. the lower one had a line. However, the upper was plugged witha screw. I can't find a vacum diagram anyplace. Any Idea what was supposed to go there?
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