this is something weird that its doing.

If you are at a light and hold the brake and bring the rpms up to 1k and leave the rpms there without touching anything, the car will change the rpm speed up and down 2-400 rpm at a time for some reason. Anybody know why it might do that? It may lead me to believe it could be a sensor of some kind?

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1999 Mercedes E300 188k and still going strong!