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Old 02-06-2003, 05:36 PM
suginami suginami is offline
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Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
Sounds to me like a vacuum leak.

I had a similar problem, and after replacing the MAS air sensor and then the throttle actuator, the problem turned out to be a vacum leak at the intake manifold seal.

A vacum leak alllows "false air" into the system, and will prevent the MAS air sensor from doing its job.
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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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