Ok Here is what I was I got the car from some guy. He had a 305 but put in a 350. do I have to change the ECU (computer) in the car too. Cause my car was working fine the other day. then in just died on me. If I hook up the OBD 1 scanner to it the car will start. But if its not hooked up then it just wont start. Does anyone know what this could be?