Causes When Car Shakes at Idle but Smooths Out While Driving M120 V12 rough idle and vibration is this normal?, I have a Mercedes Benz W140 S600 with the M120 V12 engine., I know this engine is supposed to be very smooth, but mine has noticeable vibration at Car Shaking at Idle: 8 Causes and When to See a Mechanic (2026 Guide) Ever felt your car shaking or vibrating while sitting at a red light? That rough idle is a classic symptom, but the cause isn't always obvious. As shown in the comparison,
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small vibration when idling How To Fix Engine Vibration At Idle 4 ways