You can adjust the throttle cable, at the carb. It's trial and error. You do need, just a bit of play. You can get close on the trailer. Slight adjustment, maybe necessary on the water. Takes about 1 minute. If you have the original cable, maybe time for replacement.
2004 red/white/black something or other.
Formally, 1994 RED
Mastercraft 205, Chevy 5.7 TBI.