ngk plugs
The 3.5 V6 has individual coils for each spark plug. There are of course 3 on each side. They look like little black caps with a wire connector plugged into it. They are held in with two screws each....
No, that's an indication of a problem.
platinum plugs atleast that's what they come with from the factory
yes
In a Ford Expedition it is :firewall4 - 83 - 72 - 61 - 5front