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This one did the high idle thing also. The throttle body was gummed up bad. I also had to take the iac out and clean it cause it would also stick.I always liked the Michael Jackson pick-up.
We had an 89 XJ with the Renix 4.0. That rig single handedly turned my wife off the Jeep brand forever. Electrical clusterfock, mostly engine/running related. Probably a lot to do with that anti-corrosion stuff, but it would randomly die, and not re-start, or it'd fire up and have an idle speed of 2700 rpm. The quick fix for either problem was pop the hood and give all 6 injectors a twist/wiggle, and it was good again for an unknown period of time.
Mine has a 30 hp up front and a 35 in the rear. It has 3.07’s in it now. So with the five speed and 33’s I’m looking at 4.56-4.88’s. That should put it around 15-1600 at 65.what gears and lockers are you looking at? I think all Comanches got the Dana 44 rear with the 30 up front.
What did you run in your xj?