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If you have no check engine light on the dash, before cranking, then your ecu is bad and needs to be repaired or replaced. If the check engine light is on and the jeep still won't start, might be your crank sensor is bad. Have you had the trouble codes read from the ecu? It would tell exactly what's bad.
If the light is ywllow, it's emmissions or some sensor. You can drive to a service center and have the codes read. If the light is red...STOP!! and check engine oil. DO NOT drive further!! Have it towed in for service.
My advice is that you get the trouble codes read[or buy you own obd2 reader at wallmart because around here they charge $60 for a scan and you can buy the scaner from them for less than $100 and you can check it yourself if the light comes back on].A scan tool is the only way to know for sure where you should be looking.
I hope you mean: P0321, that means: Ignition/Distributor Engine Speed Input Circuit Range/Performance Check again and post the complete trouble code. Check engine lights serves only 2 digits! OBD System read out four digits and one letter
a bad cam sensor will cause vehicle to shut off while driving, and cause a hard time starting. but this usually sets a trouble code p0340. scan vehicle to see if any codes come up. after it is fixed, erase codes with a obd2 scanner. if you do not have one, you can go to any auto parts store and they will erase codes for free.