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  1. M

    454 MAG Hard Start When Warm

    I have a 1998 Falcon 2500BR with a Mercruiser 454 MAG EFI. Since I got it a year ago it has always ran a little rich (black soot on back of boat and slight smoke at times). Decided to install new spark plugs and used NGK BPR6FS plugs. Took it to the lake for the weekend and ran for about 5-6...
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