There are major problems in the 5.4 and 4.6 3v engines because of the head-two piece plug designs in these engines. Ford changed the design in 2008. Carbon builds up around the extended tip of these two piece plugs. When they are removed they can break and leave the tip stuck in the head.
Ford has issues 3 TSB's concerning plug removal. Champion and Brisk have new one piece plugs which will help. Also applying nickel anti sieze to the tips help.

If you have one of these engines I suggest you pull the plugs and replace them with the one piece and apply anti sieze compound or face breakage down the road. If you have less than 25,000 you should not have much of a problem. I would follow the TSB which uses MC Carb cleaner to help free plugs.


Ford has done nothing except isssue TSB's and some F150 owners have got stuck with major bills when heads have to be pulled.