Fast Idle

[thammond]

I have a 1996 Maxum 1900 SR with 4.3LX mercruiser alpha one.

Had an issue this past weekend with a fast idle, around 1400 RPM. This occurred near the end of a day of waterskiing. Running fine before that.

I let it sit for a hour or so and then took the boat out for a slow tour of the lake and again had a fast idle and faster than normal speed with low throttle.

Seemed to run fine next day when I took the boat to the ramp to take out of the water.

Any thoughts on what may be the cause of the fast idle?

[mmwjr]

sticking throttle cable or sticking throttle plates on the carburetor. A vacuum leak under the carburetor can also cause this but typically is associated with a poor idle.