Tune UP PROBLEM
Do you know for sure that there is nothing in there preventing the socket from engaging the hex on the plug
Completely different issue. The 2005 5.4 used the extended 2 piece plugs. You are comparing apples to oranges.
I would still say try to look into that hole and see, is has not been uncommon or rocks or other debree to get stuck in there. One way to check woul be to look ath where the socket measures up on the other holes to that one....if they go in deeper then there is something in the hole. If not you might want to just bite the bullet and take it to a local shop.





