Well i just got back from a super long road trip totaled about 4k miles. Well the jeep did great, i couldn't be happier, i got back to miami and let her sit for a few days while i tinkered on my new izuzu rodeo. I started her up this morning and the misfire was real bad. Back when i first had the problem the misfire would go away after i backed out of my drive way and drove a few hundred yards. This time it decided to do it until i got to normal running temp... im stumped it has a full ignition tuneup, new plugs, and new o2. can you guys think of wat else it could be?

 

Double check the timing- base and ignition- just to be sure they're correct. Have you been able to identify which cylinder is misfiring?

 

Try running the truck in the dark with the hood open and look for spark jump...