Conversation Between Don Moyer and craig deem
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Don, I have an old Grampian,with the A-4,and use the champion J8 plugs just did them less than 3 months ago,boat was running on limited or not all four cylinders the other day ,pulled one by one turned ignition all had no spark,replaced with I feel are better plugs have never had problem with NKG,substitute and she now purs? why are they old plugs bad so soon?