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99 Chaparral 200LE 5.7l mercruiser stalls when warm

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I have a 1999 chaparral 200 LE with a 5.7 L MerCruiser alpha one. It cranks on the trailer fine as well as when you drop it in the water. It will run good at all speeds for a few minutes until it warms up good and then it will stall out. After that it will crank but you cannot give it throttle without it stalling. I have changed the distributor cap, rotor button, spark plugs, fuel filter and it is running some better but it continues to stall out after it’s warmed up  Any recommendations?

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