A couple days ago the one heater hose on my 1997 Mustang
GT starts on the passenger side of the intake manifold and goes right into the firewall) burst open, getting coolant basically everywhere. After replacing the hose and cleaning everything off, the car started up fine and even drove like new for about five minutes. From then on, it was misfiring horribly, making it barely able to move at all. The next day, the same thing: started and ran fine, only to misfire horribly after a few minutes and not go away.
Both times the code P0354 popped up, saying "Ignition Coil D Primary/Secondary Circuit Malfunction," so I went through the steps to not only blow out the spark plug valleys and clean everything, but I then replaced all 8 spark plugs, ignition wires, and both ignition coils. Fired it up, and it made no difference whatsoever; still misfiring horribly.
What do I do from here? I'm not sure where to go next, as I've replace all ignition parts (considering the engine code was for ignition). Any help would be hugely appreciated!!
2014 Ford Focus ST (ST3, Tuxedo Black Metallic)
1997 Ford Mustang GT (Rio Red)