electronic throttle actuator (ETA) is probably at fault.

Check my web page (click the "www" icon below) and select Menu#24 to see what happens. My car is different than yours but the ETA gives the same symptoms. The LH mode forces the car to idle at 1000rpm.

The good news is you can do it yourself if you have a will to! Good luck.

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Regards . . . . JimF
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'94 S500 Cpe

Visit my Mercedes Web Page