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This morning, crank no start. Swapped to back up coil, started fine. Runs smooth. No rough idle or high idle. I have a digital voltage display (cheap Amazon USB plug) that I pulled the cover so I can see the voltage better. It's shows1 3.8-14.2 going down the highway. My dash gauge shows...

I didn't get a chance to load test the alternator while I was off. Farm got in the way. All of the charging system wires are clean and in good condition. They are also relatively new (<6 mos) 2 GA from Jeepwires.com. I'll post as soon as I have the alternator load tested.

So, this morning when I crank it up to go to work it starts right up and has a crazy rough idle for about 1 second then smoothed right out. No rough idle or crazy high idle after that.

So far, no rough idle on start up and no intermittent failures. I'll keep a weekly running update until it breaks again.

I have not named it. I think you may be on to something. I'll look around the back of the shop for a bottle of champagne for the christening.

Thinking out loud, I may create a checklist of sorts for when the next failure happens. Something to work through in terms of checks/tests when it actually is dead that would eliminate each component/circuit systematically. Something like: Remove current coil plug/input. Wait 10 minutes...

Plus, I'm driving it today and it has run like just as smooth as a kitten. I'm waiting on the next failure.

I completely agree, the only thing that I have found that makes this JP run again (in five minutes or 5 days) is to swap another coil on. As soon as it fires up and runs I can kill it and swap back to the other coil and it runs just fine. I am absolutely baffled and I am frustrated because I...

Refreshed the dipstick ground this evening before work. Swapped distributor coil wire and plug back to the coil that was connected when it started the sputtering/etc. Let it run for an hour at idle. Idles perfect on start up. No RPM hunting. Sits at 800 RPM. Moving through the throttle...

I don't have a fuel pressure reading yet, but the pump kicks on good an loud consistently throughout the starts. It has sat for days before restart as well as an attempted restart immediately after being hot/shut off 5 minutes. The pump always kicks on with no sign of fuel leaking back/losing...

I'm not sure if it makes a difference, but mine is a 1991, OBDI engine. The sensors are a mix of various parts OEM and BWD, Omix Ada, etc. Each has been swapped with factory parts during the process to determine whether or not the sensor is an issue. There is no change in behavior for any...

ETA: No CEL/codes. All battery/alternator wiring/grounds are #2.

This JP is a daily driver for me. I drive 18 miles one way to work and generally about a 40 mile loop daily on the weekend. The off road park is 75 miles away if I head up there. The farm is about 35 miles one way and I’ll head over there a couple times a week as well. Vehicle: 1991 Cherokee...