I just bought my first fish and ski boat. A 1988 17 ft Glaston with a 1994 Mercury Force. The first time I used the boat the trim and tilt worked except when the boat was under power (moving). If the motor was trim up at all and I put the throttle down the motor would slam down to the back of the transom. I took the boat to a repair shop they told me that they do not make parts for that trim anymore and I might as well try to look for a new one. Kinda made me sick to my stomach when the guy told me the previous owner had to have known about the problem and I got took. Is there anyone that can help? I have asked around and couple people told me it was a quick fix and could be the check valve. Please help
