Lost of power under load(misfire)

what kind of dip stick??? Transmission. No dip stick as tranny is a sealed system. U cannot add any fluid or check levels. U need a special machine to pump it in. Well....actually I jimmy rigged a hand pump to refill mine after I acidentally drained it thinking I had found the oil pan! Believe it or not I am not the only one who has pulled off that ******** move.

Wish I had an answer - sounds very much like a problem I am having with my '92 LS400. I have a parts car, and have changed out the ECM, fuel pump, injectors, fuel pilter, fuel pressure regulator, ran the can with exhaust unbolted (check for clogged CATs, checked out my timing belt for slippage amoung other things, and nothing works. I have no check engine light on. Do you?

most of the time it is under the hood ,,or,,on the top of the rad,,it will have engine specs,,or when u buy them ask & any parts house could tell you,,,
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thats basically what it is supposed to do when it is kept on the floor

It sounds like a fuel delivery issue so it could be many things such as low fuel pressure from the pump,clogged or partially pluged fuel filter, a malfunctioning throttle posisitioning sensor (if you have a check engine light on) or if its turbo it could be turbo lag etc.

If you log on to http://www.jeepolog.com/UserFiles/downloads/trooper_manual.pdfnloadable manual and go to WIRING SYSTEM 8D–167
It may help you .

What grade of you do you have ? must be 5/30 fully synth or it breaks down when hot and makes for a misfire.

An O2 Sensor wouldn't cause all your Problems... I would First see if your fuel pump is kicking on, Just have your buddy get in the truck, and turn the key to the ACC notch (its the one where all the lights on the dash light up) and you need to get under the gas tank and you should hear the Pump kick on, If you don't then your Fuel pump went bad.

The Over Heating Problem, Might be One of three things 1 Low Coolent/Old Coolent. Or 2 Your Radaitor is just too old to cool effectly, Replace the Rad and you should eb good, Or third would be your fan clutch, Pop the hood, And spin the fan, if it will spin but not vary far and theres resistance. The fan clutch is good, But if you can spin the fan Freely with no restance then you need a new fan clutch.

I had the same problem, picked up a new computer for the tranny, I think it's under the seat, works fine.

GT4x4 are probably your best bet, or alternatively breakerlink or breakeryard (google for them)