I was driving my family back from Yellowstone, at the same time an escaped murderer was hitchhiking from Yellowstone when our Expedition blew a spark plug. I hate to think what would have happened if we had chosen his route, instead we traveled a more scenic route. At least we were safe while waiting 2 hours for a tow truck.

Same as everyone else's story, except we've blown 4 plugs in less than 3 months. I guess when one decides to go they all go. My suggestion, replace all plugs and coils at 100k. Good luck!!