I have owned my 96 Grand Cherokee Laredo 4.0 with 240,000 miles on it for almost a year now. It runs good and the engine doesn't sound bad at all. After replacing the radiator, water pump, and thermostat about 2 months back, my jeep began to stall out when switching from drive to reverse or when coming to stop at a red light or stop sign. My jeep will rumble and the RPMs will drop real low and usually bounce back up but at other times, the vehicle just dies. It starts back up with no problem. This usually happens during the first drive of the day, and will not act up as much the more it is driven. I cannot pinpoint what the problem may be.
Any help or comments will be greatly appreciated

 

Have you pulled out the IAC valve and cleaned it yet? Might as well clean the whole throttle body while you are there. Thats where I would start.