I have a 95 7.4 l TBI engine that will start up and idle great but once I hit the throttle and it misfires and blows out black smoke. Once it clears out it runs fine at higher RPM. I have replaced the spark plugs, spark plug wires, and cap and rotor. This has fixed the issue for a little bit then she returns.
Im at a loss of what the issue could be. I have hooked up a new coil but that didn't change anything. I was thinking about replacing the distributor next but I'm not sure.