1999 EXPEDITION 5.4 WHILE DRIVING I HEARD A LOUD NOISE .MOTOR SHUT OFF . SMOKE COMING FROM HOOD I PUT OUT THE FIRER AND SEEN #3 COIL BLOWN OUT . THE SPARK PLUG WAS NO WERE TO BE FOUND THE SPARK PLUG HOLE THREADS CAME OUT WHIT THE PLUG WHAT A HAVE SEEN FORD DID NOT PUT MANY THEARDS IN THE HEAD THY MADE A NEW HEAD FOR THAT MOTOR SO THEY KNOW THE HEADS ARE NO GOOD PLUS THE INJECTOR IS PUTTING GAS IN THAT CYLINDER THAT WHY IT STARTED THE FIRE. *TR