One other thing that I just thought of...

There is a coil of green wire (under the dash) that is plugged into the vacuum system via a rubber connecter. It looks like a stupid mistake of some sort, (like maybe Hans at the factory had a little too much beer at lunch) but it is actually the way that the factory "engineered" a controlled leak point into the system. Do not remove this high tech engineered vaccum bleed-off.