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Originally Posted by TexasGuy
Looks like a terminator for an unused port. Just a cap.
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Since that's the main manifold vacuum supply tree, you should be able to follow the lines out from there and discover some other junctions and tee's. Any coming through the firewall are climate control related, make sure they aren't leaking. Look under the dash where they come through, and follow them to the plenum and blend controls.