What is the problem with a 2001 Mercruiser 5.7 efi that seems to flood when given full throttle?
I will assume that you have throttle body efi, could be out of calibration. I will also assume that the engine worked great before. If so, then replace the throttle body, if it did not work great before, then check the timing. Too low timing will bog. Also, any modifications been done to the engine? Prop pitch ? too high, possible also. Does the engine peak at 4500-4800 rpm, good speed ? Check the prop pitch, depends on the weight of the craft, props are around 21 to 23, higher output engines can go to 25, 25 double cup, or even 27. Steel props of course ). Good luck.