THANKS You guys nailed it, I ordered the two $6.00 O-Rings instead of the $365.00 valve along with 2 Engine Air Distribution Hoses. I'm hoping that will O-Ring solve the drip and the Air hoses solve the rough low idle and stall at stop signs.

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Collector of Fine Hose Clamps
'77 240D 'AVA' is in heaven now
'80 240D Kanarienvogel
'82 300TD 343k was my daily driver 'ADOLPH' In Surgery for a severe Deer Bite to the Nose
'88 560SL 102k 'White One'