Was running fine all day, about 4 hours. Then just died. Will start but dies when I engage in Forward. Boat is a 22 ft CC, 20 years old but new to us just 3 weeks ago. Previously owner was original buyer and maintained at the same marine shop over the years. Plan to take to this local shop but would be helpful to know what to keep and eye out for. We had ran over a small fishing line yesterday shortly before the motor failed - took off the prop today and and shaft was clear of fishing line.