HVAC = Heating Ventilation and Air Conditioning.

If you look near the brake booster you should see three vacuum lines. One is a straight line the other 2 are Y'd into a single line.

One of the Y lines is the HVAC (green on my car). Remove this line and plug up the hole with a screw or something so that it does not leak.

Reconnect the vac to the transmission and go for a drive, see if you have an issue still.

I'd also recommend that you pick up a MityVac or equivalent vacuum gauge/measuing device so you can better trace down these problems.

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