ramcdona

I'm hearing a humming noise coming from under the hood. Its coming from the air intake area. I took the cover off and checked and it's vibrating. There is a part that has two hoses connected to it [PA6-(GF+M)40], that seems to be the problem. When I take this part off the humming stops. No one at the auto parts store seems to know what it is called. So I bought a haynes repair manual and the part is not shown. Any suggestions? Thanks