Hello all, I have a true mother chicken of a problem engine came to me with idle problem and low top end power. I corrected the idle adjustment and refined the idle to 6Atdc after engine warms up in test tank it idles rock solid now I have the idle set a little high because the prop is a 25pitch prop 1150 in N. now I tAke it to the lake to test run back it in and the motor won't start won't idle if it does start it dies after a few seconds. Now if I pull the boat up out of the water to where the level was in the test tank runs idles fine. Still has low power on top end. HELP!! This one is kicking my butt I have also gone through the carbs they are all clean fuel system is good no clogs kinks nothing. It's almost like it's a back pressure issue. I even pulled the lower unit to see if something was blocking the exhaust nothing. What am I missing? I took off the carbs and throttle bodies and looked into the reed plates all looked good.did compression check all cylinders get 85-90 psi
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