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These are the Champions recommended for the 4.0, but I'll have to find my receipt to be sure on the exact one. I switched out the Champion iridiums I had and there was no change. I'm going to rent the fuel pressure tester again. When I tested it last it was fine at idle, but I didn't test at...

Sorry, though I replied to this. It's the Champion single copper they recommended in the forums. I was using the iridiums, but I switched them out as part of these diagnostics. They looked good when I pulled them. Not fouled. I just replaced my CPS with a Mopar, no change.

Right? At least with a code I would have a direction. Shoot, forgot to mention those, thanks. Changed plugs (I had the Champion iridium's) for the recommended coppers and the wires are new. I also changed that piece (name escapes me) that spins in the distributor cap. There was no oil or...

Hello, all! I have a weird situation with my 99 TJ 4.0. I've had a random misfire for a while. Sometimes it's just a quick pop every several seconds, sometimes it's several in a row. There are no fault codes. Both O2 sensors are replaced (NGK), TPS, MAP, IAC; all of the big engine grounds...