For spark, I wasn't sure I had the right plugs so I went with the OEM Champion plugs that were recommended in the Bentley. I checked for spark, no issues there.
Replace those plugs with nothing other than the Champion 7989 plugs. They are about $14 each and they are a 1 piece design.
I did track it extensively, probably 3-4,000 km of track use. The only thing it needs is brake fluid and better pads and you're good to go. My car was flawless for the entire time I had it. It threw a CEL right before I sold it that was solved with a simple spark plug change. It never overheated at the track and it was a lot of fun there and very refined and comfortable for highway travel.
Pretty sure it had original plugs in it, replaced those with some autolites that were on sale, soon to put champion coppers in it though (personal preference).
Try champion part number 7989 it's one solid piece not 2 like motorcraft I've had good luck with them
Honesty I've just used Champion all year's or whatever less than five bucks and have never ever given me any issues.
I too happen to have the champion plugs that iceman has. Happened because Murray's didn't have the dealer only replacement plug and couldn't get them. I had no choice because the stock ones were blacker than my tires. They rev just fine and seem to run just as well. I was told that a long time ago champions were known to become permanantly stuck in the block though. I plan on changing soon just in case that rumor is true.
Champion plugs are barely adequate for a lawnmower...
Champions are crap.
I do know certain Toyota "sporty" cars run like crap on Champions.
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