The three valve 5.4 is the one that you hear the "horror" stories about. Best to have a 7mm 1/4 drive swivel socket to remove coils, compressed air to blow away debris before you do, and an assortment of different length extensions for your spark plug socket. If it calls for Iridium plugs, get them. Use Motorcraft OE's also. No Bosch, Autolite, Champions, or whatever fad spark plug they have on special. Antiseize and gap them. Put them in tighter than you would ANY other plug in an aluminum head, they have a bad reputation for backing out about twenty thousand miles or less down the road. Pulls threads, breaks coils, cost money.
