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A lot of ignition issues can change as the engine heats. I would still replace that bad plug - you have a spark leakage issue there. The contamination may be getting more conductive as the plug heats. Also, the ignition coil tends to weaken with age, and heat makes it worse. Worthwhile replacing if the plug alone doesn't solve it.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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