A buddy of mine has a 03 150 with the 5.4 with about 150k on it he recently changed every spark plug and all coils and still seems to be misfiring? He doesn't live near me so I've been trouble shootin over the phone. I had him locate the two lines coming off the Dpfe sensor and one line had a hole in it he replaced it and still did t fix it? Could the dPfe need replacing? Any help would be great thanks