Retreiving the codes in the DM could point you to the right direction.

The Mass Air Meter is so quick to replace that I think most shops would swap in a known good one to see if it solves the problem.

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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".