my car had similar probs and needed Air Mass sensor replacement as the CEL light was on, but also a new OVP...starts and stays started and never stalls now.

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My Cars
Mercedes CLS
Mercedes C-Class W203 - All time favorite

R.I.P.
Mercedes C-Class - W202 Lemon
Mercedes ML - Warrior
VW Jetta – Worst Car I ever owned - Alot of problems