Now that the action seems to be over, may I toss in an aside? The waste spark system with the two plugs in series is quite common, in my experience. For many years I drove a Ford sedan equipped with a Yamaha built DOHC V6. It used three coils on six plugs, also setup in series. Interestingly, from the factory it was equipped with three each of two different part number platinum plugs. One part number had a platinum center electrode, the other a platinum side electrode. As you would guess, each circuit had one of each. I've also worked on a number of GM cars which used the same design.

- JimY