98 expedition while wife was going to work. COPs go bad at least once every couple years, and good luck finding the one causing the misfire because the damn ecm will not throw a check eng light. Might as well replace them all cause in one week another will go bad. I will never own another ford. Changing plugs in one is a nightmare...oh wait I have had nightmares that didn't make me curse as much as changing those plugs. Just look under the hood; they shove the engine under the dash. Who designs a vehicle with a fuel rail directly over the plugs and coolant hoses just above that? Oh and just so you know. If you blow the same plug twice you have to have a new head.