- Check the air-to-fuel ratio - if it is too lean or too rich, it can cause jerking.
- Inspect the fuel lines for leaks or blockages that could affect fuel delivery.
- Ensure that the fuel filter is clean and free of debris.
- If the fuel system has not been serviced in a while, consider performing fuel injector cleaning or replacement.
2. Faulty spark plugs or ignition system:
- Check the condition of spark plugs and replace if necessary.
- Ensure that the spark plug wires properly connect and are in good condition.
- Inspect the distributor cap and rotor (if applicable) for cracks, corrosion, or damage.
3. Vacuum leaks:
- Check for vacuum leaks in the engine by using a smoke machine or by spraying carburetor cleaner around potential leak areas while the engine is running. If the engine's RPM increases when the cleaner is sprayed in a particular area, it could indicate a vacuum leak.
4. Idle control system issues:
- Check the functionality of the idle control valve and ensure it operates correctly.
- Clean or replace the throttle body and ensure that the throttle linkage is operating smoothly.
5. Faulty sensors:
- Inspect the oxygen sensors, coolant temperature sensors, and other sensors related to fuel and air mixture adjustments.
- If a sensor is faulty or sending incorrect signals to the engine control unit, it can cause jerking issues.
6. Fuel pump problems:
- If the fuel pump is not delivering sufficient fuel pressure, it can cause the engine to run lean or hesitate at various points, leading to jerking. Check fuel pressure and replace the pump if necessary.
