I was lucky enough to find a used EZL. It was also the problem on my car. Caused by lack of ignition system maintenance. If you have one of these early M104's, or really any car with an EZL... go do a full tune up! I mean, plugs, cap, rotor, and coil. Sometimes you can get by with skipping wireset replacement.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles