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Solved my own post as cylinder pressure tests were low, and wet tests they jumped up at least 20-30 psi per cylinder. Low compression in cylinders 2-5 was my issue. Found low mileage 4.0l engine and swapped it out. All issues solved. I went ahead and replaced all 6 fuel injector pigtails by...

I stopped using heli-coil after using Time-sert. You should take a look: https://time-sert.com/

I also checked the wiring harness , especially in back of engine where it rounds the corner- no chaffing/wire breaks. I did find the ground strap wasn't tight on engine block side back by the firewall and tightened that. I disconnected the battery and using electrical diagram ohm tested all of...

Just checking to see if you resolved the P0302 issue? I've got the same thing going on with my 2001 4.0l. Mine acting like its a vapor lock after you turn it off for a few minutes it occasionally will throw the P0302. I tested coil rail, put new plugs XP 985 Autolites in, replaced injectors...