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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,640
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As others have said, that is the warmup regulator (WUR). Your 1982 car has an oxygen sensor system, which controls air-fuel ratio (AFR), so it does not have a vacuum connection to the WUR. The blue arrow is pointing to the atmospheric vent nipple. There should be a hose that goes up to the top of throttle body, above the throttle plate, to provide clean atmospheric pressure to the WUR internal chamber.
The hose you cut and clamped goes to the center fitting of the fuel distributor. IIRC, it was originally plastic hose with a rubber jacket around it. That's why you saw some plastic inside the hose. Check the other end on the FD to see what it should look like. You will need a new one of those lines.
As Mark points out, rough running could be a lot of things, but I'll bet that you have vacuum leaks in the intake system. Very common at this age. The best tool for finding them is a "smoke tester". Search that in this forum and on the internet.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
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