What Causes the Car to Shake When in D Gear and Braking at a Red Light?

[VonNatalie]

The reasons for the car shaking when in D gear and braking at a red light are: 1. The engine throttle is dirty or the fuel injectors have excessive carbon deposits. The gasoline sprayed by the cold-start injector is largely absorbed by the carbon deposits, resulting in a lean mixture during cold starts and difficulty in starting; 2. Poor performance of the ignition system, including spark plugs, high-voltage wires, and ignition coils; 3. Abnormal fuel supply pressure, incorrect intake pressure values, and malfunctioning sensors. Solutions for engine shaking: 1. Clean the fuel system and check the idle speed motor to remove carbon deposits; 2. Check if the spark plugs have excessive carbon deposits and replace them if necessary; 3. Check the fuel pressure and replace faulty components.