75 Mercury Black Max bogs down

by mark horan
(lewes de.)

The motor runs great out of the gate for about half an hour then when I go to throttle down it boggs down, you can tell that it really wants to run when I throttle back up it just seems like its loading up if I take it back to neutral and jam it into full throttle every 2 or 3 times it will take off and rund great for a few minutes then when I throttle back down it starts to bog down again I have changed both fuel filters and the plugs and has Startron in the tank.
Again, it will run great high and low end for about 30-40 minutes then the problem starts.

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