Originally Posted by DelsJeep
Correction. You should still get a Check Engine light, but try the "crankshaft position sensor". It is small and innocuous, but if it goes bad (and mine did from bumpy trails) your jeep will drive like total crap.
very true, but when I had a vehicle w/ one go bad it wasn't temp dependant. I've seen coils go 1/2 way out and they only gave issues when temps warmed up....
get out that Ohm meter and start testing stuff.
oh does the CEL turn on when you start the Jeep? (make sure the bulb isn't burnt out.)