gsxr,
Thanks for that link!
I just printed it out and will try over the next week to diagnose/tweak. This also answers most of my questions that start with, "What the heck is this...?" VERY detailed info that will help me and others here fix their vacuum systems.
Thanks again!
-Brian

__________________
Current: '91 300TE 4MATIC 317k and climbing...
Former:
'81 300TD Wagon 168K "Tank"
'83 240D 216K 4spd manual "Da Bear" (aka best car ever)

"Never sweat the petty things...
and never pet the sweaty things."