1999 Mercury 30 Hp 4 Stroke Tiller

tinman283

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Aug 16, 2006
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Hello, I am having a problem with my engine at 1/3 to 2/3 throttle, the motor hesitates and wants to stall out, sounds like its running on only one cylinder. The motor idles well and starts on the second pull, you can throttle past the "dead spot" to wide open and it runs fairly good, but if you open the throttle gradually it wants to die out @1/3 to 2/3 throttle opening. The plugs look great light tan to grey. I had the Mercury dealer service the engine last year for a no start condition and they found the carbs to be gummed up, they disassembled and cleaned them. The condition has been there from the start of this season. I have changed the fuel filter/engine oil & filter/drained the lower unit and refilled/changed spark plugs/replaced the fuel tank. I ran a can of Sea-Foam through the motor thinking it could be the carbs again, no luck. The person I bought the boat from only used it twice in five years. Any help?? Thanks Steve
 
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