1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 197Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 197

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IGNITION SYSTEM
IMPORTANT: Proper positioning in spark plug wire supports is important to prevent cross-firing
Inspection
1 Visually inspect spark plug wires and coil wire for damage