The motor has a normal hollow clank sound to it coming off idle. Once one parks a truck it seems to fall apart after a few month of disuse. If your 5.4 never had main bearings under warranty I would worry. Another shops opinion would be best here. It's probably just cam chain related to that bank ( drivers side ). ??? When you got kids in school, you got to haul their stuff around alot. LOL Engine oil filters are mostly bullet proof now, but cam guide wear will put a lot of plastic and chunks in the pan/pump screen. It doesn't sound like yours though. Hope you didn't drive it and never do anything ( maintenance ) to it like some ( Floridians) do. The 5.4L can always be identified in a F150 by that Klank-Klank whendrivingaway.