1998 xj 4.0 inline 6 auto
new ignition coil, new distributor cap and rotor, new spark plugs, new spark plug wires, new camshaft sensor, new crankshaft sensor, new tps
checked fuel pressure, reading 45 psi at the fuel rail. Cars starts up no problem, has a rough idle at around 700-900 rpm, sometimes dies when put on reverse or drive. Took it on a test drive and it sputters and bogs, no check engine light. Jeep dies out while on test drive threw a code,p0351,p0320. Cleared codes and never came back on. Checked throttle body and unplugged iacv and nothing happened, plugged it back and unplugged map sensor, sudden change on idle drop, plugged it back. Cleared codes and started the jeep, rough idle on park and it threw another code p1391. Dont know where to start due to changing out ignition spark parts. Need help please, want to get my jeep up and running good again. Problem all started because distributor rotor broke while driving, since then never figured out whats wrong with the jeep

 

 

This may seem crazy but how new is your battery? When my alternator was slowly dying it caused my battery to start to get very low, and my XJ had a similar issue. It would sometimes die after I revved it up, or after reversing. Replaced the alternator, battery, belt, idler, all the works. Haven't had any issues since.

 

 

Try hooking up a battery charger to it and idling, and see if you still have the issue.