Thanks again and I agree about the quality conscience, caring, and knowledgable members of this forum.

Found a rotted off vacuum hose at the shut off valve and replaced it, problem solved. Knowing where to look is always the biggest first step.

Ordered the MB CD repair ROM and hopfully, in the future, my questions to this forum will be a bit better educated and informed.

As soon as the Dodge Ram PU is out of the shop (again!) I'll probably go through the entire vacuum system on this vehicle.

84' 190D
137 k miles
38 mpg
no rust and runs great