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Best spark plug 350 Mercruiser Mag

DKrenke

New member
I have developed a popping noise (backfiring) when lowering speed or acceleration and mechanic relieves it could be spark plug problem. What would be the best plug to buy and p/n? I have the Mercruiser 350 Mag in a 2004 Monterey.
Thanks ...
 
For a tune-up see Plug service Bulletin No. 2006-03
Installed NGK ITR4A15 (stock No. 5599) spark plugs (gap .060 inch) in my 2004 (EFI). I found somewhere is was O'k to continue to use these NGK plugs
BUT according to the experts above it appears to be something more
 
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