The outboard on our pontoon boat was hesitating when we would try to open it up at Full Throttle. Two other marinas would not even give us any suggestions because they do not work on Nissan's. Both of them suggested that I call Allen's. After a five-minute conversation, he suggested that I try a certain product. If the product didn't work, he said it could take a look at it. Bought the product, put it in the engine, the engine not only performed flawlessly, we gained 300 RPM and about 2 miles per hour. Whenever I actually do need to have work done on the motor, I will head straight to Allen's, where I know I will get an honest opinion. read more