One of my co worker 99 F150 blew a spark plug out of the head. I believe it's the third cylinder on the passenger side(#7 I think). His son uses the truck and he's in college. Ford wanted 3 grand to replace the head. He had the truck towed 2 hours back home to get it fixed. He took it to his personal mechanic and the guy used some type of head tread repair tool( I'm sure you guys know what I'm describing). Total cost between towing and repairs was about 950 bones. Ford also told him that plug was the most common plug to blow out. Recheck those plugs! Pearl02.