hey guys i have a 94 dakota we put a new fuel pump, it had a recent tuneup plugs, wires, dist cap, rotor, I have changed the MAP sensor, cleaned the IAC sensor, checked the throttle position sensor, cleaned the intake, switched crankshaft position sensor, put a new catylytic converter on it..andI still get a backfire whenI rev it up. After 4 or 5 minutes it wont do it. Can anyone help I am pulling my hair out with this truck!!!!!!!!!!

 

You may haveyour wires wrong or distubter postion wrong. Are you sure its back fire. When does it do it. Because I could be back pressure. Which is normal. Does it happen when you rev it up and let go of the gas. when the engine is slowing back down. if so its okay.