240 efi engine down power when is hot

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Pacha24

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Hi, I need your opinion.
I have a Utopia 205 2003 Mercury 240 hp v6 efi engine (2 stroke injection). I suppose it heats up because if I drive down 30 miles / hour when I ask it dies (almost has to turn off), but if I stay at 30 mph and more, I can drive 2 hours without any problem. If I slow down I don't do more than 20 min I have to turn off the engine, let it sit (have a beer) and I go again. It is never cold in the first moments of my ride.when I drive at 35 m / h my engine runs at 5000 rpm. Thank you
 
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