The motor starts everytime and runs great at full speed for about 3 minutes then it starts to miss. It can be brought back to an idle and is great, but anything over 1/2 speed after it is warm causes it to miss. The carb are clean, new fuel pump, gas does not seem to be the issue, new water pump is pumping great, cylinder missing appears to be the bottom one. Could this be an electrical issue? This is a manual start outboard.