Rough idle only while sitting in park. As soon as I give it gas, it levels out real nice. Any ideas????????

Check for a Vacum leak. Try cleaning the throttle body and IAC. Does your Check engine light come on?

No Check Engine light, I cleaned the throttle body and it got alittle better, but not much

clean the IAC inside throttle body, very easly to do

Barder23, You probably want to check out your m.a.p sensor and t.p.s sensor first, since the both of them can contribute to your rough idling. Just pull off the vacuum from the m.a.p sensor and see if it stays the same or changes. Unhook the t.p.s and see what it does too! and if it hasn't been done in a while, a tune up with spark plugs, wires, rotor and distributor, air filter, oil change, and fuel filter. I just got a XJ and the oil hadn't been changed in a good while, it was idling pretty rough then i changed it, added some lucas oil stabilizer and it made a difference in smoothing that rough idle and gaining its performance/power back.

Did this start all of the sudden?

To: 1more88XJ
I changed all that you said and afterwards it idled very smooth @ 900 rpms. Thanks a million

To: dima4855
I bought the Jeep under this condition and just trying to get it road worthy.

Thanks everyone who relpied for the help.