Do you remember unplugging any vacuum lines? If you still have the original intake, take a look at that to see any vacuum line connectors.

You could try spraying some carburetor/throttle body cleaner around different areas to see if there is a change in idle or sound.

Maybe you can post some pictures of different areas of the air intake and intake manifold.

 

I don't recall unplugging any vacuum lines, although I yanked the resonator out without actually looking first. I'll take some pics tomorrow.