So I went and started playing around with my vacuum system last night, and per your advice, I started in the trunk area. I noticed a few things that I'm not sure are correct or not, so this is kind of like a choose-your-own-adventure book

I started off with the gas tank door. When I took it apart, there was only one vacuum hose going into it - it was the yellow hose with red stripe. I could see the trunk lock hoses running underneath it, and I noticed that there were two: The Yellow and (Red and Green). When I looked a little bit down the line, I saw that the Y/R line split in two before, right before the gas door (one for the gas door and one for the trunk), but there was no split anywhere in the Y/G line.

So here's my first question:

1)Are there supposed to be two vacuum lines running into the gas door vacuum pod? A Y/R and a Y/G? There were two nipples on the pod, but there was no sign of a Y/G.

Anyways, when I tried the vacuum directly to the pod, it worked fine, but when I put the vacuum on the line itself, I got nothing, so I figured the leak had to bed somewhere before there. The next thing I did was take the glovebox out and looked at the lines there, before they split off into the door.
When I tested the vacuum between that point and the rear elements, I was able to hold a vacuum, but when I tested the line coming from the engine, I was not able to get any reading.

2. Can I assume then that the leak has to be somewhere either in the driver's door or under the hood where they all split off?

So when I looked under the hood, where all of the vacuum hoses go into connectors right before they go through the firewall, I did notice that one of the Y connectors had a nice little tear in it.

C. Without knowing more than that, is there a fair chance that my entire problem stems from that bad connector?

Anyways, I hope I'm at least somewhere close to the answer.

Thanks!