[willy]

Blue Man did you happen to notice the fuel primer bulb when this was happening, some of what you are saying are problems I had with diffrent motors over the years and they traced back to one, fuel bulb, even a new one cause they are all crap now, two, fuel pump on the side of the engine.
If not those and the plug pull does not reveal any issues in one or more cylinders time to run an auxilliary tank.
Also a good run like you had last week in some rough water can combine with the ethanol crap in your gas to dislodge a lot of sheeeet in your tank and lines, check your in line filter and the fuel/water seperator, you are likely to find unidentifiable sheeet in one or both of them.