Car in question: 2014 Mercedes-Benz E350 BlueTec 7G Tronic (252Hp, 620Nm)The Problem: The car's idle rpm at startup is always at 600 but in very very rare cases, the car's idle rpm becomes and stays at 700-750 randomly. Sometimes just after 10 minutes of driving.A few times I started up the car and the idle would be at 600rpm and stable, I then would lightly rev the car once to around 1000rpm and as the needle goes back down, it stops at around 750rpm. Ive also noticed that the car's throttle response is much better when the car's idle is at 700-750 rather than at 600.Does anyone have any idea what might be causing this issue?
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