I have a 1985 150 v6 mercury, and everytime i try to throttle up boat to plane out motor craps out and alarms goes off with a steady beep beep beep , if I idle engine back down it quits. I can throttle boat all the way and still can not go over idle speed. Any help would be greatly appreciated. Ty. I have changed water pump, poppet valve, both head sets, and thermostats. Nothing i've done has made it any better.