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    spark plug gap/timing on 15psi

    As the title says. Im running 15psi on stock 440s with a lex afm. SAFC2. aero afpr.wallbro255. It sounds like faint spark plug blowout, or could it be detenation? My plugs are NGK 4644's. Gapped at .028" my timing is 12degrees. It only seems to do it around 4000 rpms+ my AFRs go rich when it...
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