Mercruiser V6 Engine Test Run #3

Here you can hear where the engine starts to break up at around the 5 second mark, a problem I'm trying to figure out and suspect it's a carburetor issue.

[fastst]

Sounds like a fuel starvation, dropping a few cyls in short order. what are your plans for plugging the transom window from the old stringer? I'm doing my best to keep my 66 omc 200 running, 300 inch buick V8