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I have a 5.7 mercruiser efi IO 2002 What does tune up consist of.Iwent to take the plugs out and i cant get one out can i do any damage trying to get them out.
Watch out! It is possible to break the spark plug off in the cylinder, and let me tell you, that is a pain. If you can't get them out, I would consult someone who might have a better tool or contraption to serve the purpose.