there's a screen in there too that you might want to replace..it's about a 1" cyclinder shoved in under the black casing that the pcv valve goes in. Autozone didn't have the screen - got mine at O'Reilly's. Reach behind like ECU said, it's in the lower intake attached to a hose. Pull it out. I would assume it would be a good time to do the screen as well, but i'm really not sure if it's a regular maintance item or not...I just did mine while I had my lower off Either way, if you're gonna take the screen out, pull the black casing thing out of the lower and prob. just jam a screwdriver or something into the screen and pull it out. It's really a cheap and simple thing to do
One way to get the screen out, get a really long screw driver (like 12"+) and attach a wood screw to it(with a small clamp or something), thread it into the screen and pull it out. I had a number of cuts from trying to get to it by hand. They do clog up and can cause you to blow the rear main.