It's the crank sensor!
Join Date: Nov 2007
Location: Central Minnesota
Start with fresh Champion copper plugs gapped to .035, new plug wires, distributor cap and rotor.
Failing to freshen tuneup hardware when symptomatic often results in the chasing of your tail.
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!