Been a while since I've been here. Haven't been here since I was 17 but I'm getting back into the Audi game, possibly. Well, if this car doesn't give me too much trouble. lol Car is great save for I notice it has a huge vacuum leak. There is a big nipple on top of the throttle body with nothing going to it. When I plug it, the car dies.

Is there a specific line that goes to this and if so, where to? I can't find any lines hanging or any other open ports.