I had the same problem. It went into limp mode. Loss of power, I lost my power steering, everything power. They replaced the mass airflow sensor. It hasn't happened since, but I still have intermittent stalling. You can see my posting at:
1998 Volkswagen Passat Intermittent Stalling Idle or Idle Stalling. One or the other.
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Sunday, June 1st, 2008 AT 7:34 PM