I believe there are 2 ways of adjusting the idle (or that I know of - someone can/will correct me if I'm wrong)
TPS - which should be a little black box on the throttle body. It will probably have several bolts (I know my Festiva has 2, havent looked at the Jeeps yet) that will loosen it and allow that to turn. Turning it will turn the adjustment screw that paintguy was talking about.
Idle screw itself - which should also be located on the throttle body. There is probably a plastic cap over it and that will again turn either way with a screwdriver to adjust the idle.
These were the ways that I was able to adjust the idle on my Festiva.
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