For seemingly no reason at all, my 300SE (W126) has decided to idle at ~ 1200 rpm instead of her usual 600 rpm. She does this hot and cold. Apart from that she is running and performing as before. What's going on, where do I start looking to slow her back down?
All help and comments greatly recieved :) Mike
Check for simple mechanical possibilities - that the throttle linkage has free movement over its range and that - don't laugh, it's happened - the floor mat isn't pressing the accelerator.
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