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    1987 80 hp Merc Idle Problem

    This motor (Serial No. OB153661) idles OK (for a 3 cylinder)when in neutral, but when I put it in gear, it has a stumble, like possibly an ignition or fuel problem with one cylinder when the prop puts the motor under load. Even with this stumble, it has never stalled. The idle is set at 600 rpm...
  2. V

    Mercury Idle/Stumble/Knock Problem

    I have a 1987 80hp 3 cyl outboard that runs great at high speed (anything above 1,000 rpm) , however when the engine (cold or hot) is at idle, it goes into an stumble/knock mode. It never stalls. When I get above 900-1,000 rpm, the problem goes away. When it is stumbling, the rpm is about...
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