Why Does My Car Shake at Idle but Smooth Out While Driving? Experiencing excessive vibration while driving? Don't ignore the signs! This common issue can stem from several problems, including damaged engine mounts, unbalanced tires, or a bent driveshaft. Ignoring these can lead If your car shakes at high speed the cause is often mechanical imbalance. Small issues become more noticeable as speed increases. Unbalanced tires are a common reason, creating vibration that grows Why Is My Car Vibrating? The 5 Most Common Reasons Ride Time Why is My Car Vibrating? MOOG Parts