I have a 1989 Evinrude 28 hp that I need a little help with. Like many of the other post I am new to the maintenance portion of the boating world so any help would be greatly appreciated. The problem is that the motor will not accelerate till the controls are at 3/4 throttle. It shifts into forward and reverse with no problems however only idles to the 3/4 throttle position . From 3/4 to WOT the motor run fine. It seems that the cable adjustment at the motor has little or no effect on the problem. Any advcie would help....