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There'sa number of things that can cuse those symptoms, and you'll have to have the car scanned by the SDS (Star Diagnostic System) instead of a generic code reader. This will provide much better diagnostic info, including things like fuel trim adaptation values and so on.
Don't begin throwing parts at! Replacing the Air Mass Meter, fuel pump relay or other things willy-nilly might eventually solve the problem, it but will set you back a fortune. You need a good mechanic that will do the following...
Read the codes and adaptation values to get going in the right direction. Let's suppose the AMM is suspect thanks to high (1.32) fuel trim values. He/she should replace the AMM with a "known good" unit and re-test. If that solves the problem, install new part. This is the process that a good MB mechanic will use, and ask about how they go about diagnosis.
As for dealers being the only ones that have SDS, that is not true. Good MB indies have SDS and all the same technology and access to hardware/software that dealers have. My own mechanic can do all the same diagnosis work the dealer can. However, in the short term, until you find a trusted MB mechanic, a visit to the dealer might be required...
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