ASR light has been coming on and when this happens engine idles erratically back and forth between 1000-1500rpm. car drives ok but accelerator pedal travel is like limp home mode, except power is not affected and car seems to have full power...i.e. l can drive the car at 80mph with asr light on, just have to push pedal more.
Pulled code 6.
any ideas....anyone????thanks in advance.

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1993 500SEL