This won't help you, but FWIW - on my 2005 KJ, I occasionally get a CEL for a random misfire (say, every 500-600 miles or so) that sometimes goes on to be pinned down to cylinder 1 or cylinder 2. If I do nothing, the CEL goes off after the set number of key cycles (I think it's 40), meaning that the problem hasn't recurred - until about 600 miles' time.
I changed all the coils and plugs back at the start of the year, so I don't think it's those. The crank sensor is still the factory original at 125K miles.
I did find the diagnostic manual (note, NOT the FSM - the diagnostic manual is separate) for the KJ online somewhere, which laid out the full factory procedure for chasing down misfires. I think I'll have to try and find it again. It was quite involved and needs the DRB3 to complete in full, but essentially it tests every possible cause, including a leaking fuel injector.