My engine would run fine at idle and WOT but after it warmed it up it would bog down and die when trying to get my boat on plane. I rebuilt the carbs, drained the gas and replaced with fresh gas, checked all my fuel lines, changed plugs, checked compression and replaced the VRO pump. I did all this over a couple of months and it still did the same thing. I took it to the boat repair shop to have them look at it. I was surprised to find out that with the Ethanol gas, that is pretty much standard at all gas stations now, was my problem. The ethanol gas and plastic carbs require an adjustment of the air/fuel mixture on the carbs. You may need a special tool to do the adjustment but once adjusted you should be back in business before you know it. I am by no means an expert on motor repair but thought I would share this to everyone in the BOC.