Thanks, everyone for your suggestions and will keep them in mind. I hope that it is not a complicated mess to fix. It was pouring rain here the other day and having to open the hood and have the water collected in the grill drip on my head is not fun.

Yes, the EGR valve is still connected in the car. I tried the paper clip suggestion to see if there was some sort of blockage. Unfortuantely, a good idea that didn't work.

I find it strange, though, that the same line pulls vacuum from the large white nipple but no vacuum from the 2 smaller ones on the same line. I have also disconnected the one brown line from one of the smaller nipples not pulling any vacuum. Upon connecting the vacuum pump, the car immediately shuts down.

__________________
Brian
'94 E420 - 99K
'12 C300 4 Matic

Previously owned:
'06 CLK 500K Cabriolet
'85 300SD (Old Smokey)
2002 Boxster
2002 C320 (The five-pointed star Mercedes)
1993 300E 3.2 (Dealership's cash cow)
1979 300SD (Chrome beauty)
1983 300D (Old faithful)
1983 240D (Right lane cruiser)
1977 240D (Miracle of bondo)