1. Engine Misfire: A misfire occurs when one or more cylinders in your engine are not producing power. This can cause your car to shake, shudder, and lose power. A misfire can be caused by various factors, including faulty spark plugs, ignition coils, or fuel injectors.
2. Transmission Problems: If your transmission is not functioning correctly, it can cause your car to shudder when stopped. Some possible transmission problems that could cause this issue include a faulty torque converter, worn clutch plates, or low transmission fluid.
3. Driveline Issues: Shudders when stopped in drive can be caused by problems with the driveline, such as a worn-out driveshaft or faulty driveline universal joints.
4. Faulty Motor Mounts: Motor mounts are designed to hold your engine in place and reduce vibration. If the motor mounts are broken or worn out, it can cause your engine to shake when stopped.
5. Vacuum Leak: A vacuum leak can cause your engine to run rough and shudder. This can be caused by cracks or breaks in hoses, seals, or gaskets.
Identifying the exact cause of your car shuddering when stopped in drive requires a thorough inspection by a qualified mechanic. It is not advisable to drive your car if it is shuddering violently, especially at intersections or stoplights, as it can be dangerous for you and other road users. Have the issue diagnosed and repaired by a professional mechanic to ensure safe and smooth operation of your vehicle.