Engine vibrations can be alarming and indicate an underlying problem in your car. Here are the key causes of engine vibration while driving or idling: 1. Spark Plug Damage: Damaged spark plugs Vibrations during the engine operation Spark Plug Conditions: Lean, Rich, Oil Fouling, Normal Wear Farag Ali posted on the topic LinkedIn What Causes My Car to Vibrate When Idling? Gil's Garage Inc of Halfmoon How Do I Stop My Car from Vibrating While Idle? Small World Auto Repair