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1994 Force 90 miss

Got a 90 hp that has a miss in it at WOT. You can run it all day at 3/4 throttle & it won't miss a lick. When you go full throttle it will run about 100 yards then start missing & won't stop even if you go back to 3/4. It will miss until it almost stops. It acts like it is only running on about 1 to 2 cylinders then will eventually clear up & run fine unless you go back to WOT. It is always hard to start after it sets while you are beached for a few hours. Most all the electronics have been replaced with CDI stuff. Any Ideas? Thanks, Scotty
 
Water in the fuel.Bad diaphram in pump.Tank vent line blocked.Ethanol delaminates older hoses making them soft.
Check compression. Jerry
 
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