While out today I tried to accelerate from a stop. When I got to 2000-2200
RPM the engine started revving higher and sounded as if something was
slipping and I had no more acceleration. Couldn't go fast enough to get on
plane even though engine revving about 3000 when slipping. Think prop OK as
only a couple of years old and have hit nothing but weeds with it. Any
ideas? This has happened before 2 years ago but when I got out of the
throttle and then pushed it agin it came right up.