1987 Sea Ray 230 CC w/ Mercruiser 260 Alpha One keeps stalling AFTER going into reverse and only AFTER I increase throttle ever so slightly. Makes docking very difficult. This all started several weeks ago when I splashed it after sitting for 6 months. At that time it stalled going into forward. Had mobile marine mechanic swing by and of course; it worked fine tied up to the dock. Thinking it’s time for a lower shift cable job but not convinced it is related to this stalling problem. Thoughts?