I have a 35 hp mercury made in 1985. I have it on a party barge that is 20 feet long. The barge is not that heavy {dont know exact weight} . The motor is running good, but I don't think it is really running to its potential. It isn't singing to me at full throttle. If I push the the throttle all the way the motor kind of dies out a little. What is out of adjustment, or what do I need to check?<br />I appreiciate the help, Tim