pulley noise

Video Here I would like to think it has something to do with my air control sensor at this point, but this is still occurring after months, just like this, at any speed (less noticeable at higher RPM). I just replaced the pulley tensioner and serpentine belt before taking this video. Can anyone...

I already changed the tensioner because after tightening everything I saw the belt was riding wobbly on that pulley. Noise did not go away. It seems to be coming from the top of motor near alternator. I'd hate to spring for a new one and it not be the problem. I'm going to take belt off and see...