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Vacuum system

Engine

Vehicle Information: Year: 1977; Body Type: Targa;

Since purchasing my 1977 2.7L 911S, it has seemed like a bit of a lame duck at low rpm's and speeds. Looking at my vacuum system, I replaced the vacuum advance on my distributer. That helped a bit but I noticed a t in the line to the distributer with the other line capped with a screw. There is also a fatter line off the throttle body capped with a screw. Do you possibly have a 1977 vacuum diagram? I've found a 78, 79, and 80 diagram, but all seem a little different.Thanks

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