wow mike, thats perfect. I had been able to find the end of the line at the yellow plastic box mounted on the trans but the hose went up over the trans and I couldnt trace it.
I will take the hose off near the intake opening and will check the vacuum. I'll post my results.

Also, I have a question about the throttle cable that goes to the transmission...
My Haynes manual wasnt very descriptive in how to adjust it, any suggestions, and what can be changed by adjusting it?

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1992 190E 2.3
150,000 Miles