My jeep will crank fine but once you give it gas it starts missing and back firing. I've replaced the map sensor, coil, ignition module, distributor, TPS,fuel pump, plug wires, cap and rotor. Checked the grounds and cleaned. Checked the catalytic converter. Hope you guys can help I'm out of options.

 

Wow. That's a lot of parts to throw at it.

Tested fuel pressure? Indexed distributor? Firing order correct? Hose from throttle body to MAP in good shape?

Ever done Tip 5 in my link below?

 

I'm having similar issues and just started digging into it.....I'm subscribing to see if you find anything. And if I figure mine out ill post it as well.

 

TEST your fuel pressure first.