Hi, I have a 1986 190D.

I have a loose black vacuum line at the driver's side firewall that is not connected to anything. It is just laying there.

There is a series of vacuum lines that go through the firewall at that location for door locks that is connected to a yellow circular junction. The black line is just laying there and I think it may be the source of a vacuum leak that is causing my car to not turn off immediately.

The vacuum pump tests good and so does the shut off switch.

Anyone know where that black line should be connected?

Thanks!