Similar symptoms, it stutters on the highway or under heavy load. It has been steadily getting worse over the last few weeks, and now has gotten to the point I cant drive it to work. One new symptom is a P1391 trouble code.
So far I changed the CKP sensor and tested the TPS. New cap and rotor.
I pulled the Ignition pickup off the distributor and when I bend/roll the wires it sounds like they may be cracked, possible from heat? I am replacing the Pickup under warranty tomorrow.
also when I was looking around today, I noticed the ECM was pretty warm. I just got back from a 20 min highway ride from work but the ECM seemed exceptionally hot. Should I be concerned about this?
1999 Wrangler TJ 4.0 5spd -- 6" LA , 35" MTZ's , Ford 8.8 , 4.88 gears , SYE , Tom woods CV shaft