I have a 1999 Jeep Cherokee. 4.0 6CYL. I can be driving down the road and my jeep will just cut off. I try to crank it right back up and it wont crank. If I let the jeep sit for a while and "cool off"....it will crank back up and run for a while before cutting back off. I don't know what to do. I thought it was a fuel pump and i replaced it. That didn't fix it. I thought it may be the Ignition Coil pack, so i changed it and that did not fix it. Any ideas. ?

I have heard to check the distributor, the Crankshaft sensor or the computer.