My 30hp mercury wont run at full throttle?

I have a 2009 mercury 30hp 4 stroke outboard that will not run at full throttle. It shuts down to a idle speed and I have to turn the key of and restart the motor. It again does the same thing if I go full throttle Runs great at a lower speed. It will not accelerate if I don t cut the key off and start all over.... show more I have a 2009 mercury 30hp 4 stroke outboard that will not run at full throttle. It shuts down to a idle speed and I have to turn the key of and restart the motor. It again does the same thing if I go full throttle Runs great at a lower speed. It will not accelerate if I don t cut the key off and start all over. What is the problem?
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