* Transmission Issues: This is often the primary suspect. Problems within the automatic transmission, such as:
* Worn-out clutch packs: These cause slipping and jerky acceleration, especially when shifting gears.
* Low transmission fluid: Insufficient fluid leads to overheating and friction, resulting in jerking. Check the fluid level and condition (it should be pink and clean, not brown or burnt).
* Solenoid problems: These electrical components control fluid flow within the transmission. A faulty solenoid can cause erratic shifting and jerking.
* Torque converter issues: A failing torque converter can slip and cause jerking, especially during initial acceleration.
* Ignition System Problems:
* Spark plug wires: Worn or damaged wires can cause misfires, leading to uneven power delivery and jerking.
* Spark plugs: Fouled or worn spark plugs will result in poor combustion and similar symptoms.
* Distributor cap and rotor (if applicable): Cracks or corrosion can disrupt the spark delivery.
* Fuel System Problems:
* Fuel filter: A clogged fuel filter restricts fuel flow, leading to inconsistent power and jerking.
* Fuel injectors: Clogged or malfunctioning injectors can deliver an uneven fuel spray, resulting in rough running and jerking.
* Fuel pump: A weak fuel pump might not provide sufficient fuel pressure, particularly under acceleration.
* Computer/Sensor Issues:
* Mass airflow sensor (MAF sensor): A faulty MAF sensor provides inaccurate air flow readings to the engine computer, leading to incorrect fuel mixture and jerking.
* Throttle position sensor (TPS): A malfunctioning TPS gives the computer wrong information about throttle position, affecting fuel delivery and causing erratic acceleration.
* Engine control module (ECM): Although less common, a failing ECM can cause a variety of problems, including jerking.
Troubleshooting Steps:
1. Check transmission fluid: This is the easiest and most important first step.
2. Inspect spark plugs and wires: Look for wear, damage, or fouling.
3. Check the fuel filter: Replace if necessary.
Since the 1996 Intrepid is an older car, many of these issues are likely related to wear and tear. A mechanic with experience in older vehicles will be able to diagnose the specific problem most effectively. Simply describing the symptoms might not be enough for an accurate diagnosis over the internet.
