dogpoor,
Sorry for the late response... I had the same issue over the summer. The following was my solution:
Crankshaft Position Sensor located on the LHS of engine was becoming overheated. I removed the housing and cleaned all of the debris/mud from both the sensor, housing and harness. Additionally, the harness wires were becoming frayed. I electrical taped the individual wires then wrapped the entire harness in tape. I decided to wire loom and reroute the harness closer to the bulkhead and away from the LHS exhaust downpipe.
Easy fix for me and only the cost of electrical tape and wire loom.
Good luck,
1990 RRC, 3.9L, AUTO "Willow Pond" (Sold)
1996 D1, 4.0L, AUTO "Lucas"
1999 RR, 4.0L, AUTO "Belle" (Sold)