Simple Question: What is the function of the EZL? I am not familiar with the 103 engine, and I am trying to help a friend fix her car..the Mercedes shop says the hesitation in the engine is due to a worn out EZL ...

Also, anyone know what the part number for the EZL would be? 1991 300e is the car

Thanks..

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1993 300E, 2.8 M104 .....