I have a 1996 Cherokee country and it threw a p0420 code. It had been starting right up, no issues. So I cleared the code and immediately after it cranked but would not start. I reset the ecu but still it would crank but not start.

Anyone deal with this before? Have any ideas?

 

That shouldn't have happened. OK, you know that. Time to verify spark and fuel pressure

 

recently replaced the crank sensor, cap/rotor, fuel pump. Could it maybe be a crank sensor short at the firewall?

 

Without testing, I can't tell. The first thing I would do is pull the coil wire off the cap, stick a phillips screw driver in it, crank the engine with the key on and put the screw driver close to a ground.