Engine stops, although very slowly, when I remove the key and the doors are locked. Otherwise I have to hit the stop lever. This issue came on all of a sudden. I can't even get it to shut off even when I put the mityvac on the vacuum control valve. All connections are still good and rubber connectors are only a couple of years old.

Does this sound like a leak in the door locks somewhere or is the vcv shot?

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900

Try using the mityvac on the shutoff valve itself.

If it shuts off properly then you have a leak somewhere. I would not suspect the vcv as the main suspect. If it shuts off with the doors locked then that suggests the leak is in the doors vacuum system.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

Same thing happened to me. I isolated the AC (Green Line) and it stopped.

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Remember, Safety Third!
'99 E300 Turbodiesel, '82 300TD, 1996 12V Cummins Turbo, '94 Neoplan - Detroit 6V92TA