1991 merc 115 elpto Sn0D019809 Bad Idle & Charging question

Joined
Mar 12, 2006
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22
Just bought the boat, motor runs great, except at idle, sounds like it has a big cam in it, really lopes, and shakes, when you accelerate either slowly, or quickly it smooths right out and runs great. Any ideas where to start would be appreciated, timing, fuel filter, I would assume these would also affect the top end though, thanks for any ideas in advance, Also will the charging system on this motor charge more than one battery at a time while running? thanks Brad
 
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