first try pulling the codes again. you cycle the key on then off the on then off then on on the third time leave it on and it should flash. it sounds like it might be spark related. keep a spark plug tester with you and when it does it, check to make sure you have a spark. the 2 snesors the jeep need to run are... crank and cam shaft position snesor (map is nice to but not NEEDED to run) everything else is jsut to trim the fuel mix. i bet if you aren't getting spark and fuel its one of those 2