Toro snowblower surging

So over the summer I left old gas in my snowblower. Therefore, It wouldn’t start so I drained the gas and cleaned the carburetor. After I did that, I got it to start but it started surging and gas was leaking through the bottom of the carburetor. I just replaced the carburetor with a new one and it’s still surging. Any ideas on what else I can try. See video. Toro Power Max 826 OE.