run autolite or motorcraft plugs, those are the only ones! All the others are junk.

I liked my JBAs they just finally wore out on me after 80k miles.

+1

I wouldn't say the other plugs were junk, they just aren't the optimal heat range and reach for Ford's 4.0L engines.

Or any Ford engine for that matter. I have changed several plugs on Ford Engines, I personally think they run the best on Autolite or Motorcraft plugs.

Good point Zach!!!

It's amazing how bad Bosch plugs run with Ford's EDIS, but how well they
run in my gas Mercedes! However, after reading how the platinum electrodes
will fall out of the insulator on Bosch, I'm now running NGK platinums in my Mercedes.

I'm using Bosch Platinum +2s, and Bosch spark plug wires, no complaints here.

lol i had autolite double plats with new stock wires and i had this terrible misfire i tried everything i even got new single plat autolites and it still misfired but all i did was switch to bousch 4+'s and got belton wires and it hasnt misfired since