'87 Throttle Box Manual
 

Does anyone have, or know where to find, the manual for the throttle control box for a single Alpha/ Bravo One. Boat was originally an Alpha and was converted to a '90 Bravo 1.
MY problem is that to accelerate I have to advance the throttle very gently. But it'll throttle back just like normal. Even being very easy on it I can't reach full throttle. I can get it to about 3300rpm. Just before this issue started it would run 4400rpm. Just throttled down, and then was goofy. Like it's slipping and not grabbing the cable going forward.
TIA
And it has absolutely nothing to do with the prop hub or out drive. Strictly a throttle to carb issue.