I recently picked up a 1998 Jeep Grand Cherokee Laredo. It have the 4.0 L 6 cyl. It's a fun vehicle to drive when it doesn't stall out. It will run fine for days at a time and then one day it will start missing and stall. If I leave it sit for a few minutes it will start right up and run fine. I changed the plugs, plug wires, distributor cap and rotor, map sensor and throttle position sensor. Any ideas on what else could be the issue? Fuel Pump maybe? Any assistance would be appreciated.

 

Seems like the crankshaft sensor is a likely culprit, do a search for that.