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    91 43 Merc high speed suddenly drops

    "My 4.3 runs great for couple "My 4.3 runs great for couple hours, then it suddenly drops from about 4300 rpm to 3000 rpm. Has stalled once but usually just falls. Pull back on gas to slow down and will run okay at 10-15 mph at 3000 rpm. Did tune-up w/o wires. Replaced fuel vent weeks ago...
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