* Spark Plugs and Wires: Worn, damaged, or fouled spark plugs and ignition wires can cause misfires, leading to jerking and a check engine light. This is a relatively common and inexpensive fix.
* Ignition Coil(s): A failing ignition coil can prevent one or more cylinders from firing properly, resulting in rough running and jerking.
* Mass Airflow Sensor (MAF) Sensor: This sensor measures the amount of air entering the engine. A faulty MAF sensor can send inaccurate readings to the engine computer, leading to a lean or rich fuel mixture, causing poor performance and jerking.
* Throttle Position Sensor (TPS): The TPS tells the engine computer the throttle's position. A faulty TPS can cause erratic idling and acceleration issues.
* Oxygen Sensor(s): These sensors monitor the exhaust gases to ensure proper fuel-air mixture. A faulty oxygen sensor can lead to poor fuel economy and rough running.
* Catalytic Converter: A failing catalytic converter can restrict exhaust flow, causing a loss of power and jerking. This is a more expensive repair.
* Transmission Problems: While less likely to directly trigger a check engine light, transmission issues *can* cause jerking. A slipping transmission or problems with the torque converter should be considered, especially if the jerking is most noticeable during acceleration or shifting.
* Fuel System Issues: Problems with the fuel pump, fuel filter, or fuel injectors could also lead to jerking and poor performance.
What you should do:
1. Get the trouble codes read: This is the most crucial step. You can use a relatively inexpensive OBD-II code reader (available at auto parts stores) to retrieve the diagnostic trouble codes (DTCs). These codes provide valuable clues about the source of the problem.
2. Consult a repair manual: Once you have the codes, consult a repair manual specific to your 2003 Ford Taurus. This will help you understand the meaning of the codes and guide you towards a potential solution.
3. Take it to a mechanic: If you're not comfortable working on your car yourself, or if the codes point to a complex issue, take it to a trusted mechanic. They can diagnose the problem accurately and perform the necessary repairs.
Ignoring the problem could lead to more significant damage and more expensive repairs down the line. Addressing the issue promptly is recommended.
