Bought this 1966 95hp merc,was in storage for thirty years,has good spark and compresion. Put in new water pump.Took carbs off tore apart and cleaned and put back together with new gasket kits and new floats, also did same to fuel pumps.Now the motor starts and idles good and goes like snot,but after about 20 minutes it starts to bog down to the point that it is at full throttle and barely staying running. If you throttle it back close to idle it will quit and good luck getting it to go again. But let it sit for half an hour and it is back to normal and then before long it starts to act up again. Cap and rotor are in good shape and I checked the point gap and it seems okay. Any ideas. thanks Bryan