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What would cause a 1997 Saturn to jerk occasionally after all gears have changed and running over 50 mph Could it be as simple dirty fuel filter or am I looking at transmission problem?

Several factors could cause your 1997 Saturn to jerk occasionally at speeds over 50 mph after all the gears have changed. Determining the exact cause requires diagnostics and inspections. Here are a few possibilities to consider:

1. Dirty Fuel Filter: A clogged or dirty fuel filter can restrict the flow of fuel to the engine, causing a lack of power and occasional jerking. Replacing a fuel filter is relatively inexpensive and can be easily done as a DIY project.

2. Transmission Issues: If the transmission is not shifting smoothly or is experiencing mechanical issues, it could cause jerking or shuddering while driving. A transmission problem may require professional diagnosis and repair.

3. Engine Misfires: Misfiring engine can also cause jerking and loss of power. Check the spark plugs, ignition coils, and fuel injector to ensure proper functioning.

4. Vacuum Leak: A vacuum leak in the engine or intake system could affect the air-fuel mixture, causing a rough running engine and occasional jerking. Check for any leaks or loose vacuum lines.

5. Driveshaft Issues: Problems with the driveshaft or U-joints can cause vibrations or jerking at higher speeds. Inspect the driveshaft and universal joints for any damage or excessive play.

6. Oxygen Sensors: Faulty oxygen sensors can provide incorrect feedback to the engine's computer, affecting the air-fuel ratio and potentially causing jerking or stalling. Check the oxygen sensors for proper function and replace if necessary.

7. Faulty Mass Air Flow (MAF) Sensor: The MAF sensor measures the amount of air entering the engine. A malfunctioning MAF sensor can affect the engine's performance and cause intermittent jerking.

8. Electrical Issues: In a few cases, electrical problems such as a faulty ignition switch or bad wiring can also lead to intermittent jerking. Check the electrical system for any loose connections or components that may be causing issues.

. It is recommended to have the vehicle diagnosed by a qualified technician . Who can pinpoint the exact cause of the jerking issue and recommend appropriate repairs.