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Mercruiser 7.4. Been sitting two years. Cranks and runs good…

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Mercruiser 7.4. Been sitting two...
Mercruiser 7.4. Been sitting two years. Cranks and runs good above 2500. Dies at low rpm unless throttle is pumped.
Submitted: 3 years ago.Category: Boat
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Answered in 5 minutes by:
6/22/2015
Marine Mechanic: Tan, MerCruiser Certified Technician replied 3 years ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,412
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Hello. Could I get the engine serial number please?
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Customer reply replied 3 years ago
It's a 1996 model. 300 hp with carborator. Will be a few days to get serial no
Marine Mechanic: Tan, MerCruiser Certified Technician replied 3 years ago
Ok try tiis with the flame arrestor off close the choke about half see if you can get the engine to idle by using the choke plate. If you can get the engine to idle then you have a dirty carburetor or a vacuum leak. Has the engine been sitting unused for awhile? Chances the carb is the problem.
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Tan
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Tan, MerCruiser Certified Technician
Category: Boat
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