Slight vibrations and rpm tremble on idle and stop light Solve Rough Idle Now: Main Causes of Shaking at a Stop Why Does Your Engine Vibrate at Idle? Noticing your engine shaking or vibrating while idling? This could mean something isn't right under the hood. Here's what might be causing it and how Is steering wheel vibration normal while idling? Why Does My Car Shake at Idle but Smooth Out While Driving? Is your car vibrating when idle? Here's when you should be worried