spark plug ?
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Joined: Jul 2005
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From: madison, south dakota, u.s.a.
i was told to run zfr7f-11 (ngk2975) plugs in my NA 11.5/1 b16 and they keep fouling out, afr's are between 12.7-13.2......am i using the wrong plugs or do i need a tune???
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