Serial # is J5969414 and Model # is J150STLCRD. Boat is a 77 Sterling ski boat. I am the third owner and know previous owner well. Prop is SS 19 Pitch and run 4500 RPM to 5500 RPM. Motor is making a knocking sound and wants to die on me when I full throttle. Has done this since i have owned it and last time it died i got a knocking sound in the engine that wont go away. Runs real rough and doesnt start very well either. Please help . Do not have dealer to close and can usually handle most wrenching my self. Thanks
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