Ok. You didn't say what size engine was in the Jeep, but based on your problem, I'd bet its the 2.5L 4 cylinder. They had a classic issue with intermittent failure of the crankshaft sensor. This will cause the vehicle to just shut down without any other indications, Sometimes it will restart immediately, sometimes it can take minutes to hours to restart. The sensor is easy to replace and not very expensive. It is located on the drivers side of the transmission bell housing.
SOURCE: Jeep Cherokee starting issue
On an intermittent start problem like this you may be having a starter solenoid issue or your wire on the starter from the key switch may be loose. Or you may have a corroded battery cable or the safety neutral switch may be going bad. Is it a automatic? If it were it would be the clutch safety switch going out. So do the simple things first. Clean cables like the first guy said if that does not fix it locate the starter and if you have jumper cables the next time it does it put the positive lead of the jumper cable on the Positive battery terminal and the other touch to the starter wire with the key in the run position where the big wire on the starter is, if you here it spin it means the starter motor is ok if it don't it is bad or the connection on the starter is loose. Also a bad battery cable could cause this from the battery to the starter next put a small wire into the end of the positive jumper cable and touch the S terminal on the starter if you here a solid clung it means the solenoid is good. So check the connections on the starter and tighten the starter bolts as they may have worked loose and don't have a good ground. So if you want more as stance just post on my question and I will hell p more and if this is more informative please rate
SOURCE: 96 jeep grand cherokee starts but wont idle
CHECK FUEL REGULATOR ON FUEL INJECTOR RAIL,&ALSO FUEL PUMP, CHARLIE
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