It does sound like fuel starvation. I had a 250 that did that, but on single bbl.It's drawing air,the noise you hear, but not enough fuel.You could try choking it manually by blocking the air flow over the carb stack with your hand and maybe free up a something blocking the fuel line before dismantling it. And of course make sure the carb mount bolts are snugged up. Then get your fuel filter.
