1. Spark Plugs: Worn or faulty spark plugs can cause the engine to misfire, resulting in sputtering and shaking. Check the spark plugs and replace them if they are worn or damaged.
2. Fuel Filter: A clogged fuel filter can restrict the flow of fuel to the engine, causing it to sputter and shake. Replace the fuel filter if it is dirty or clogged.
3. Fuel Injector: A faulty fuel injector can cause an imbalance in the fuel mixture, leading to sputtering and shaking. Have the fuel injectors inspected and cleaned or replaced if necessary.
4. Ignition Coil: A faulty ignition coil can prevent the spark plugs from firing properly, resulting in sputtering and shaking. Check the ignition coils and replace any that are damaged or malfunctioning.
5. Vacuum Leak: A vacuum leak can cause a lean fuel mixture, which can lead to sputtering and shaking. Inspect the vacuum hoses for any leaks and replace any that are cracked or damaged.
6. Catalytic Converter: A clogged or damaged catalytic converter can restrict the flow of exhaust gases, causing the engine to sputter and shake. Have the catalytic converter inspected and replaced if necessary.
7. Oxygen Sensor: A faulty oxygen sensor can provide incorrect information to the engine's computer, which can cause the fuel mixture to be incorrect, leading to sputtering and shaking. Replace the oxygen sensor if it is faulty.
If the problem persists or if you are not comfortable performing these checks, it is recommended that you take your car to a qualified mechanic for diagnosis and repairs.
