Fuel pressure problem, i think.
 

I'm having a prob with my 96 xj 4.0. I had to change the crankshaft posi sensor about 2 weeks ago. It was running great now having similar problems as before. It runs with the rpms up but when it goes to an idle it cuts out then dies. Once it starts it will run for a few sec then die, get the rpms up and it'll run, let off the gas to an idle and it'll cut out then die. Has anybody had this prob before?