Originally posted by suginami
My problem was a vacum leak - at the intake manifold - which is quite an unusual place for a vacum leak.
The leak was at the intake manifold gasket.
I have read posts from the technicians that help out on this site, that they usually test for a bad MAS by swapping it with a new one.
It takes more time to diagnose one that it does to replace it. They only take about 5-10 minutes.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".