Mine idles high, around 1K until the engine gets warmed up, then it sits around 700, if not a little lower. I was running at around 650, but have been having issues lately with it dying on me when driving. The idle would drop really low when letting off the throttle. I upped the idle a little and that seems to have helped. I just adjusted the idle the other night. gmakra has the correct process, but forgot one step. When you adjust the idle screw you are actually manually setting where the throttle linkage sits. As a result, your throttle position sensor (TPS) will be off. It is just a POT that relays where the throttle is to the EMC that helps to control fuel on sudden acceleration changes.
To adjust: Connect up a volt meter positive to the blue wire, ground to black, and measure the voltage when key is in the run position. You should be right around 0.50 V If you are not, you can loosen the screws on the TPS and rotate it some to get the voltage you need. You may have to take it off and wallow out the holes a bit to give you some wiggle room. Rotate it and tighten it back up. Make sure you dont leave the key in the 'run' position too long or you risk burning up the ICM. Best to just unplug it and not worry about it while working.
Also the picture 1986cj put up has the plug that is difficult to remove. If you have that one, grind it flat then drill a hole in it to access the screw.
Colorado Jeep Club Member #2086
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