Jerking while driving at slow speeds can be caused by several issues. Here are some common causes:

1. Fuel System Issues:

   • Dirty Fuel Injectors: Fuel injectors spray fuel into the engine. If they are clogged or dirty, it can cause an uneven fuel supply, leading to jerking.
   • Low Fuel Pressure: If the fuel pump or fuel filter is faulty, it may not supply the engine with enough fuel, causing jerking.

2. Ignition System Problems:

   • Worn Spark Plugs: Spark plugs ignite the air-fuel mixture in the engine. If they are worn or dirty, they may misfire, causing the engine to jerk.
   • Faulty Ignition Coils: Ignition coils provide the spark plugs with electricity. If they are malfunctioning, the engine may misfire, resulting in jerking.

3. Transmission Issues:

   • Transmission Fluid Problems: Low or dirty transmission fluid can cause rough shifting or slipping, which may feel like jerking.
   • Transmission Wear: If there is wear in the transmission gears or clutches, it can cause jerking, especially at low speeds.

4. Engine Control Module (ECM) Issues:

   • Faulty Sensors: Sensors like the oxygen sensor, mass airflow sensor, or throttle position sensor send information to the ECM to adjust the fuel and air mixture. If these sensors are faulty, it can cause jerking.
   • ECM Malfunction: If the ECM itself has a problem, it can cause erratic engine performance, including jerking.

5. Exhaust System Problems:

   • Clogged Catalytic Converter: A clogged catalytic converter can restrict exhaust flow, causing the engine to run poorly and jerk at low speeds.

6. Air Intake Problems:

   • Dirty Air Filter: A clogged or dirty air filter can restrict airflow to the engine, causing it to run lean and potentially jerk.
   • Vacuum Leaks: Leaks in the vacuum system can cause an uneven air-fuel mixture, leading to jerking.

7. Mechanical Issues:

   • Engine Mounts: Worn or broken engine mounts can cause the engine to move excessively, leading to jerking sensations when accelerating or driving slowly.
   • Clutch Problems (in Manual Vehicles): If the clutch is worn or not engaging properly, it can cause jerking, especially at lower speeds or when shifting gears.

8. Electrical Issues:

   • Battery or Alternator Issues: Problems with the vehicle's electrical system, like a weak battery or faulty alternator, can cause jerking due to inconsistent power supply.

What to Do Next

If your vehicle jerks while driving slowly, it's best to have a professional mechanic inspect it. They can diagnose the exact cause and recommend the necessary repairs to ensure safe and smooth driving.