another update:
problem solved and basically no rough idle...I cleaned my schematics sticker enough to actually read it and don't know why I didn't look earlier. It seems that the vac line (white/yellow) did go underneath the intake where I heard the hissing and the others were fine as I traced them according to the schematics. So far she ran like a champ into work this morning and all I need to do now is continue with the stuff I was replacing anyway like the dist cap, rotor,etc... Whew! Next project is to locate some polyurethane suspension components to replace the rubber bushings. Thanks for the help Steve

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1997 E320
1986 560SEL
1983 300SD
1972 220D
1970 250C SOLD
1971 250C SOLD