It's the crank sensor!
Join Date: Nov 2007
Location: Central Minnesota
With cylinder 4 misfiring, yes it could be related to the head issue.
What exactly is your oil pressure at HOT idle and over 1600 rpms. The spec is as follows:
*Not less than 13 psi at HOT idle
*Between 37-75 psi over 1600 rpms
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!