Join Date: Dec 2012
Location: Lafayette, Indiana
Bronco Info: 91 Bronco w/ 5.0 L V8, Auto w/ E40D
It almost sounds like you have too much fuel and not enough air. Or your timing is off. Either way, the back-fires are caused by incomplete fuel burn, either from the too much fuel, or the exaust ports opening too soon. Check for those before you start worrying about the computer. You could also check the intake system. Just in case. I'm sure everyone has had an experience where we forgot to check the simplest things.