Truck broke down no fire.. replaced coil, ing mod,cap rotor.. got fire truck runs... truck down again no fire

I recently had a similar problem. I drive a 94 ram 1500 with the 3.9 6 cylinder. When I replaced the coil it started right up but then cut out and wouldn't start. So I wiggled the wire that plugs into the coil and tried to start it and it fired up again and the next day it wouldn't start. My problem was were the wires connected to the plug came loss. I went to the junk yard found any ram truck from 94 to 01 with either gas engine 3.9-5.2-5.9 and cut the plug off with decent amount of wire and installed it on mine and problem was solved. I also had a catalytic converter problem about 3 months after that was similar but it would start right up and run in neutral fine but when it gear it would bog down and eventually stall. Good luck.