5 pin for a 4 pin

The reason I was asking is because I'm having ignition problems and I have a 5 pin lying around that I was going to throw in to see if that was my problem.I put my timing light on my coil wire to see how it was firing,it would flash real fast like all cylinders are firing and all the sudden it would start to hesitate and and my light would stop and start to flash and the the car would just shut off.I've check ignition switch to ballast and it's constant 12.5 when the key is on.I've checked the other side of the resistor and get 6 volts+/-.I've checked the gap on the reluctor in the distibutor.So the only thing I could think of next was the ECU.Speaking of ecu can I run the chrome one in a stock application?