I will plan on removing the exhaust elbow and inspect. If that looks clear, I will move to the fuel injectors.
When I purchased the sailboat, late fall 2018 and the engine was surveyed in excellent condition. It ran at the proper RPMs.
Maybe this is a coincidence or not, late 2019 I got caught in a nasty storm for most of the day and it really tossed me around, and within the last 1/2 mile to the marina, my engine died. I knew something was wrong because I was losing RPMs and power; I restarted the engine within 20 minutes, and later in the fall of 2019 and into 2020, I corrected the issue by chasing down air leaks into the fuel system and clogged filters.
I continued to struggle with the issue again 2020 as I found another leak in the older hose (that short hose between the filter to the bleed valve) and it started hard.
So this winter I replaced everything from the tank to the bleed valve, and also cleaned the tank and replace the fuel. During 2020, fighting my air problem, it never got to the proper RPMs. Although I am not getting RPMs at load, the engine does not act like when I had air and clogged filters, as it starts up fine and does not stall.
So I am wondering if my injectors are dirty from the above but I would think that I would notice the engine not running right at lower RPMs and not starting well.