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my 92 ski naut. runs very rough at idle speed. after warming…

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my 92 ski naut. runs...
my 92 ski naut. runs very rough at idle speed. after warming up,it runs great until i return to idle speed.after doing this engine dies. whats my problem.5.0 ho,no dist. cap or fuel injection
Submitted: 8 years ago.Category: Boat
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Answered in 18 minutes by:
6/9/2010
Marine Mechanic: shane j forrest, Marine Mechanic replied 8 years ago
shane j forrest
shane j forrest, Marine Mechanic
Category: Boat
Satisfied Customers: 270
Experience: 20 years experience merc,volvo,omc
Verified
have you pulled the spark plugs and inspected them? also have you done a compression test on the engine?
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Customer reply replied 8 years ago
havent tried either one. it ran fine for 15-20 min but quit when i returned to idle speed
Marine Mechanic: shane j forrest, Marine Mechanic replied 8 years ago
start with removing all the spark plugs and doing a compression test on all the cylinders they should be within 15% of each other. if the engine passes the compression test i would replace the plugs make sure you gap them to the factory spec. dont rely on the parts store saying they are pre gapped because they are not.
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