1994 Jeep Cherokee replaced flexplate & tourque convert

i replace the flexplate and torque converter in my jeep, hooked up all wires and it was running before but had to replace the flexplate and torque converter due to previous owner didn't install properly and damaged them. well anyways i tried to start the jeep and it turns over and chugs like it wants to start but don't. i've replace the neutral safty switch, the crank sensor, replace the spark plugs, spark plug wires, cap, rotor. anything else?
keep in mind it was running when i bought it with the broken parts.