Im thinkin you should not hang around this guy too much. I look at our world today and stupid looks like it can spread. lol. Here is what I would try first. Sounds weird but it will relive alot. With the jeep running. Pull one spark wire at a time and put it back in and go to the next. If nothing changes you have eliminated alot of problems. If they way it runs does not change when pulling a wire. You either have a rod not moving or a piston or bad plug wire or plug. Would also eliminate if you have a bad dist or coil. This will change alot. and will really narrow your problem down.