Re: 1995 Nissan 9.9 carb problems
If it's a 2 strokes engine, probably carb was not correctly cleaned out still with some varnish, gunk inside, how's gas pump diaphragms condition, dried, cracked, balooned ? If so, replace all. You could have air entering through hose connectors o'rings because are dried out or wored with use or even shorted plugs that fails when giving juice.
Happy Boating