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I agree with Jbrew. If you leave the plugs in for that long then its your fault your having problems with them. Ya its a poor design by ford using a two piece plug but what are you accomplishing by coming onto a f150 forum and complaining?
I have a 2004 5.4 FX4 with 203K miles. I bought the truck in 2006 with 30K miles. Still rolling with the original plugs. I think I might change them soon though :P