FIXED - hissing noise from under glovebox on acceleration
I tested my vacuume reservoir with a hand vacuume pump and it was able to hold the pressure so, it is working fine. The problem is somewhere else.
I followed the black vacuume line through the firewall. In the engine compartment, there was a coupler. It did not sound or appear to be leaking. I took it apart and cleaned it... problem solved.
The noise that was coming from the vacuume reservoir under the glove box went away when I fixed the connection under the hood.
A good thing as the dealership charges $209. for the vacuume reservoir.
Hope this helps someone else.
Kerry