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Sounds like to me the firing order is off, or you have your plugs wires backwards. Maybe a carb issue also. Check for a vacuum leak.

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βˆ™ 2007-12-08 05:37:01
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Q: What is the problem with your 1996 454 multiport fuel injected boat engine it seems to be running rich and once the engine is warm it does not idle shuts down and requires a lot of throttle to start?
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