You might have a vac leak that is just starting to show itself. Sorry I can't point you in the right direction as I'm not familiar with your engine or chasis. There's probably some vac diagrams on here somewhere, I'm sure. Having a MittyVac is dead useful for finding vac leaks.
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Seth
1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo
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