2001 Jeep Cherokee. New engine April 2019 has run fine until January 2020 when it started stalling while at a stop light. Idle goes down to 750 or less and engine dies. Always restarts and very occasionally will run rough afterward and act like the ignition is cutting out but not too often does this happen. Can get it to not stall if you press the accelerator pedal just prior to stalling and it always restarts fine. Has never happened until the temp is up to 210. Can run the truck for 10-15 miles with lots of starts and stops just fine then pulling back into the driveway to park it and it stalls.
No codes displayed.
The key light will light up on occasion but rarely. I do not recall ever seeing that key light on the dash prior to this.

Parts replaced the following when the new engine went in:
Crankshaft position sensor (Mopar) Idle air control valve (Standard). Throttle position sensor (Standard), Battery

Parts replaced after the stalling issue started:
Fuel pump (carter), Cam sensor (Mopar), Coil pack (Delphi), Coolant temp sensor (Standard)

Returned to original TPS but no change. Returned to original IAC valve but no change.

Removed the PCM to check the grounding and looked for screws that go into the case that are too long and short out but no screws were present on mine.
Wiggle tested the wiring harness throughout the engine compartment. Cleaned several of the grounds and checked continuity.

Before i replace the PCM what have i missed?
Thanks for your help!

 

Boy, it sounds like the CkPS again. Got a spare to try? Hate to shoot the parts cannon at it.

 

Ever clean your throttle body? Normal maintenance.

 

throttle body clean as a whistle. I'll put the original CkPS in it and see if that helps.
Thanks,