Jeep has a reading of Manifold Absolute Pressure senor Voltage High

Check the connections to it and all vacuum lines to and around the engine.

Listen for vacuum leaks (hiss).

The higher the engine vacuum, the lower the voltage reading.

Here Below is a url copy & paste it to new browser window its a trouble shooter test for MAP sensor

http://troubleshootmyvehicle.com/jeep/4.0L/map-sensor-diagnostic-tests-1

Here is another url for it if its the 2.5

http://troubleshootmyvehicle.com/jeep/4.0L/how-to-test-the-map-sensor-1

I have a 1998 Jeep Grand Cherokee Limited 5.2 it only stays running for 10 to 15 minutes now!! Broke down when I drove it all the way to Ky. from NC It had been cutting off while driving and would restart when motor cools down!!! It has became worse....brother changed disturber cap also button, plugs and wires!!! Put in new fuel pump and filter.....Still shutting off when motor heats up!!! Will be checking all the above replies....Thank you for your help.... I'll be sure to let you know if it helped!!!

Now that I have some more information the distributor has a module pick up that can cause these symptoms, It is located below the rotor button and is a small item. Some distributors have to come out to replace it but others do not. It may have a different name but any good sales person at good auto parts store will know it by the "pick up". I had a bad pick up once and those symptoms you state happened to me, I used my snap-on brick and I could not find it with the computer. I changed it out just to rule it out and to my delight it never did it again. Mine just died after warm and after about 30 minutes it would go again for 15-20 minutes and die, I always made it home but took a long time.