I took the boat out this weekend and it stared porposing on me at any speed above 29 MPH. I have an extream shallow so it is a 2 stroke inboard jet w/only about 60hrs on it and I've had it for two summers now. It is sooo bad that it will all most bring the whole boat out of the water once it gets in that up and down mode. I was wondering could the impeler need to be worked on? I looked at it but it looks like a normal run impeler with some wear on the edges. I've looked and checked all other parts on the jet unit and also no damadge under neath the boat to the hull. What could this be??????