Famous for failing in rain
Ford coils especially on F-150, Explorer, Mustang - water leaks into spark plug well. When water sits around coil boot, coil shorts and causes misfire P030x. Common problem.
3. Causes "bucking" at highway speed
Bad Ford coil doesn't always cause hard misfire at idle. Often you feel jerking / bucking at 60-100 km/h under light throttle - that's classic Ford coil failing.