How is the coil pack numbered on a 1998 Ford 4.2 L V6?

The coil pack on a 1998 Ford 4.2L V6 isn't numbered individually like spark plugs. Instead, it's a single unit with multiple ignition coils firing multiple spark plugs. The firing order is what dictates which cylinder each coil activates. There's no numbering system *on* the coil pack itself to correspond to cylinders. You'll need to refer to a wiring diagram or a repair manual specific to your engine to determine which coil fires which cylinder.