Join Date: Nov 2004
Location: Southern Ontario
4.0L or 5.2L? CEL on? You need to get the codes. Key in ignition: 3 "on/offs" ending on "on" should display any codes stored.
Either way, check cap, rotor, plugs, wires. Replace if you have the $100 that stuff will cost.
If it still doesnt start, I'd remove the ignition coil (2 bolts, 30 seconds) and inspect for cracks. Replace if cracked (~$30).
After that, you're looking at camshaft position sensor (disc inside of distributor), crankshaft position sensor (under jeep, on top of bell housing PIA), ASD relay and then the computer.
A failure of any of these things can result in no-start condition.