Okay.. So the other night I pulled in to a gas station, filled up, and got back in the car.. Start it and it was running REALLY REALLY rough, actually sounded like it was a V8 with a MEAN cam.. so i popped the hood, and there was a HUGE vaccum leak.. it was a vac. hose that came off of the throttle body area.. It's pretty big too.. its about half an inch in diameter.. What is it for? what does it do? If needed, I can get a picture.. but i dont have access to a camera right now

 

btw this is a 1997 3.8 A4

 

no one?

 

Follow the line & see what it leads to. Probably the brake booster.

 

the brake booster will make the car run like that?
I dont think it is.. cuz i drove it a few feet with it off and the brakes worked just fine.. as mentioned in another thread in the tech section, it goes in to a plastic heat shield..

 

Does your car idle down real low and then shut off.....if u r not giving it gas....if so then it could be your PCV valve.....and your lebow to the PCV valve....

 

yeah thats most likely the one... it doesn't die, it sounds mean as hell actually..