1. Faulty Spark Plugs or Wires: The spark plugs or spark plug wires may be worn out or faulty, causing misfires and poor fuel combustion. Check the condition and replace the spark plugs or wires if necessary.
2. Clogged Fuel Filter: A blocked fuel filter can restrict the flow of fuel to the engine, resulting in sputtering and jerking. Replace the fuel filter if it appears dirty or clogged.
3. Dirty Throttle Body: Over time, the throttle body can accumulate carbon deposits and become dirty, leading to irregular fuel flow. Clean the throttle body and its components to improve its efficiency.
4. Vacuum Leaks: Check the vacuum hoses and lines for cracks, disconnections, or leaks. Repair or replace any faulty hoses to ensure proper airflow and fuel mixture.
5. Fuel Pressure: Use a fuel pressure gauge to check that the fuel pressure is within the specified range. A low fuel pressure can cause the engine to sputter and jerk.
6. Ignition Coil or Distributor Cap: In older vehicles, a worn-out ignition coil or distributor cap may cause inconsistent spark delivery and engine jerking. Inspect and replace them if needed.
7. Failed Oxygen Sensor: A malfunctioning oxygen sensor can provide incorrect data to the engine's computer, leading to improper fuel/air mixture and engine jerking. Consider replacing the oxygen sensor.
8. Transmission Issues: In rare cases, transmission-related problems, like a faulty torque converter or transmission solenoid, can also cause the engine to sputter and jerk while in gear. Have a qualified mechanic inspect the transmission if the problem persists after addressing the above potential causes.
For an accurate diagnosis and proper repair, it is recommended to visit a qualified mechanic or auto repair shop, especially if you are not familiar with vehicle repairs.
