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I can tell you NOT to look for a crank shaft position sensor. These are only used on distributor-less ignition systems. You have a distributor for sure, so don't worry with that.
You have obviously replaced just about every sensor you have on the Jeep. You need to run some tests to make sure of some things. Just to be sure, I would run a compression test. Compare the compression of all of the cylinders. If they vary by 10-20 psi..you've got a problem. After that, perform a cylinder-leak-down test. This will tell you if everything is sealing well internally. Then perform a fuel pressure test. Once you have ruled out any problems with pressure, then look into bad connections. Most electrical problems are caused by poor grounds, so get out your meter and check for any breaks. If you still haven't found anything abnormal, check vacuum lines. Like someone posted earlier, these rubber lines cotarize after years of heat and they become brittle. You need to run these test to determine where, specifically, the problem is so you can isolate it and fix it.
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