Got a 95 cherokee I'm working on one minute you can start it up and it'll run fine purr like a kitten shut it off and go to start it back and it runs like crap anyone know why I've changed crank sensor distributor parts plugs and wires fuel pump fuel filters internal tank and external only thing I haven't changed is fuel rail and injectors but I don't see how that could be the problem considering sometimes it runs fine for a minute any clue as to what can fix this

 

Sounds like a air/fuel mixture problem that is presenting itself as soon as the operating temperature is warm enough to go into closed-loop mode (when it starts using the O2 sensors for fuel trim adjustments). This can cause a situation where cold starts seem good, but subsequent warm starts are problematic.

Usually the system starts using the O2 sensors at around 80-100f coolant temperature (about 2 minutes after dead cold start). Subsequent warm starts will use the O2 sensor almost immediately (0-20 seconds).

This can be brought on by a failed/failing upstream O2 sensor.

 

Jordan's theory is sound, as usual, so I'll second the suggestion for replacing the O2 sensor.

The only thing I'll add is that you must buy an NTK brand replacement for the best outcome (this is the OEM supplier). The XJ is very picky about O2 sensors and even respected brands like Bosch can give you trouble.

You can get an O2 sensor socket set as a loaner tool from your local parts retailer - it makes the replacement quick and easy and I'd definitely getting it before doing the replacement. If you live in an area that gets a lot of rust it helps to spray the old sensor down with PB blaster the night before attempting to remove it.