So a while back I had a pretty bad idle. I started to check for leaks in vacuum lines + found that If I plugged the hose that's on top of the UIM (S5 NA) in between those four intake runners, that my idle would be good. I only plugged the top part as well. The sensor that is there I left open.

http://www.rotaryresurrection.com/2n...s_removal.html

Pic 13. I found this site + saw that its the AWS hose. What exactly does it do? It's part of emissions (duh) but beyond that I have no clue.