So I am pretty certain I have a vacuum leak behind the eaton because for a while it was makin a whistling noise and now it sounds like an air leak, which is also causing my car to not idle properly sometimes. My question is, from looking at my pics below, which part do I need to replace to fix this? This picture shows where the leak sounds like it is coming from. This one shows where the hose leads to around the right side of the eaton I put this one up to show the other side of the hose and to ask whether this thing I'm holding at the end is normal? I bought the car as it is and I'm not sure if this is stock or not. When I move this hose around, the noise changes a little so that is why I assume its from there.