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If you have no spark try pulling the spark plug out while still connected to the wire and ground out the spark plug on your vehicle. By doing this you can see if you are getting spark at all from your coil packs. If you have any questions about grounding out the plug please do some research first. while you have your plugs out if you have not done so make sure that they are not fouled out and by doing this test the problem will most likely lie with either your coil packs, spark plug wires, or spark plugs themselves.
Did you check for spark? It sounds like you're not getting spark. Check for spark. If you are not getting spark then it sounds like you might have to replace the coil packs. Is it running a L4 engine? If its running a standard chevy L4 its probably the coil packs. Try to replace them check again for spark.
Spark plugs get there voltage from the ignition coil packs, more then likely you have a bad coil pack or coil pack boot, pull one coil pack or spark plug wire or boot at a time, if you see a drop in rpm, that one is good, if no drop bad coil pack.
Try resetting the asd "auto shut down fuse had a similar problem the jeep would crank but did not get spark or gas also check your fuel pump? and the asd relay may be bad it will prevent the jeep from getting no spark and will not fire some jeeps have security problems
It is probably the coil packs or spark plugs. Buy a bottle of Prestone complete fuel system cleaner and add to gas. If this does not solve the problem, check each coil pack for spark. One or two may need replaced. This would be a good time to change the spark plugs also. Be sure to use platinum plugs.