about a week ago the transmission on my 1987 300d started shifting really hard. I just got the car in the shop today to figure out why. I connected a vac gague teed into the line that goes to transmission pressure modulator. I found there was no vacuum. I then checked for vacuum at the vcv and found that there was no vacuum after the vcv but had vacuum before vcv. i took the vcv off the ip and applied vacuum to it manually with a mity vac it holds vacuum and will not release no matter how it is adjusted. has anyone ever seen this before? Does anyone have a good one they would like to sell me?

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it