I am a bus mechanic for a small bus company(7 ford E-350's). I've only have one van that keeps spitting spark plugs it's a 2000 with a v-10. I've heli-coiled 5 out of the 10 cylinders. Dont go to Ford for help unless your truck is under warranty.Ford insists that it does not have a problem. Ford needs to go to comsumer affairs.com and see how many prolems they have.