I bought this boat to take the motor off of and put it on my 15' Whaler. Unfortunately I can't get this thing to run right. I have taken it out 3 times and all three times I have had the same results. This is what happens: Starts great, idles great etc. I can leave the motor running forever and idle around with no problems. The problem starts once I give it power and get up on a plane. After 1-2 minutes of cruising around maybe 25-30 mph the boat will start to lose power. Within 30 seconds of that the boat will get off a plane, and not go any faster than a quick idle speed. It will usually idle ok, but now it will sometimes stall. Giving the boat full power either produces nothing or the boat will plow through the water but not get up on a plane. Any ideas on what this could be?