OP, what all have you done to this vehicle? Your post starts out changing the PCM. I think i recall you having another post but sorry I dont have time right now to run it down and read it.
He came on here about a month ago with a stalling concern
, and a suspicion that it might be the fuel pump - based on a grumbling noise from the rear, and the car started up after he thumped the tank with a mallet.
Of course, he then got some "no need to test, here's your problem, just do it" posts. Following these, he cleaned his IAC, replaced his battery and tightened connections. He may have done some other work. Ratmonkey and others were trying to get him to test his fuel system. He tested his fuel pressure while everything was working properly, but I don't believe he ever monitored the fuel pressure during a stall or no start (which, he really needed to do to properly eliminate the fuel system as a problem).
He then assumed his fuel pump/filter/regulator are OK. He said he was going to test the CKPS, but never reported the results. He also wiggled PCM connections & rapped on the PCM & backed the Torx screws out of the PCM (lol ... I still am amazed that this propagates) & cleaned and re-seated the PCM connectors & finally removed the covers from the PCM (I don't think he resoldered the connections, just took off the cover to look at it). When he put it back together, the Jeep wouldn't start.
(Unfortunately, he didn't do tests at this point to diagnose the problem. No starts are the best times to do diagnosis. He just assumed it was the PCM and then bought a PCM.)
This thread was started after he bought a replacement PCM ... and the stalls continue.
Through all this, he still hasn't done the simple tests to even know if it is a spark problem or fuel problem.
I can understand his frustration.