1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 7Get this manual

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Section 1CTroubleshooting Table of Contents 1C-1 Used Spark Plug Analysis 1C-2 Normal Condition 1C-2 Chipped Insulator 1C-2 Wet Fouling (Oil Deposits) 1C-3 Cold Fouling 1C-3 Overheating 1C-3 High Spee

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