joel,

You never stated the car model. If it is an early model with a simple vacuam guage, it should peg in the black zone at idle. If it doesn't, AND you have a rough idle, I would suspect a vacuam leak somewhere.

Good luck,

------------------
Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles