1984 300D Turbo Vacuum leak

Hi,

I am losing vacuum from the black line near the oil filter housing that goes in to the firewall. I tried to figure out where it goes under the dash to no avail, it seems as if it may have been capped and the cap fell off. Does anyone know if I am right? I should add that if I cap the line, everything seems to work as it should.

Thanks,
Sal

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