Need Help: Car Starts cold and then konks out and restart takes forever.....

I think you can sub in any Mopar ECU from any Mopar car,into your 5-pin harness, and it will run your car for testing purposes. I don't know what the differences might be between all those boxes. But I have collected a bunch of them,over the years, and everyone of them ran on my 367 68 Barracuda when I plugged them in for testing purposes.

But you cannot plug a 5-pin ECU into a 4-pin harness,lol.