Here are 6 of the important sensors for the Jeep. All these are my brand new spares i keep with the Jeep. Mine is a 1995 4.0, OBD1.
Along time ago, when i was afraid of my Jeep and didn't understand it (and thought the only person who could fix it was the dealer, and parts prices were astronomical), my Jeep broke down and i had to get it towed. The workshop diagnosed a faulty coil and cam sensor. Cost me a bomb. That was 10 years ago. Recently, it stopped suddenly again. Cost me $40 and 5 minutes of my time, using one of my sensors.
First trick is to check for codes, then fault find fuel and spark, then look for potential easy fixes like sensors, wiring, fuses etc. If its mechanical, it will usually let you know by clicking, clucking, overheating, flashing engine lights etc...
Cheers,