Hi, this is my first time posting but I need a lot of help... I just got a 1998 audi a4 2.8L v6 Quattro from my grandfather as a hand-me-down and it keeps revving itself from 1000rpms to 2100rpms for no reason when idling, I found out the vacuum reservoir was disconnected and just left there and the actuator arm as well but I really can't tell what goes where since it seems to differ from the diagrams... I'm unsure if I need to buy more things other than the new hoses... (Here's a couple pics of what I can see so far...)
This is an unknown line that idk where it comes from or where it goes to and is also torn

This is the broken line from the manifold actuator

And this is how the vacuum reservoir was left
Please help