Mopar MPI rough running issue
I have the Mopar MPI injection on my CJ and it has started to run poorly, it started out somewhat intermittently but now happens consistently. It starts right up, runs smooth for a few minutes and then goes to crap. It runs really rough, more than just one fouled plug type of chugging, its more like a rumble strip on the side of the highway type shuddering... its "seems" to come out of it with RPM, as when I am going down the road and I get on it is seems to go away, or I cannot feel it any more at least. If I leave in gear (standard) when going down even a slight grade it will back fire. It smells of unburned fuel badly. I have checked fuel PSI, its around 40, I have changed plugs, cap, rotor, wires, and coil, with no improvement. Might it be a crank sensor? I don't think its mechanical (timing chain) because it seems to run ok for brief amounts of time esp when I first start it.
For a little while shutting it off and restarting it seemed to help.. (clue?)