What Causes Poor Acceleration and Inability to Reach Higher RPMs?

[StJuliana]

The following are possible reasons for poor acceleration: 1. Insufficient fuel pressure: The fuel pump may not be functioning properly, or the fuel filter or injector could be clogged. 2. Clutch-related issues: At around 3,000 RPM, the speed should be approximately 100 km/h. If the car struggles to accelerate or lacks power, it could indicate a clutch problem (oil contamination or wear). The issue might be less noticeable when the engine is cold but becomes more frequent as the temperature rises during driving, potentially leading to a complete halt (when the clutch plates are severely burned out). 3. Motor malfunction: Possible issues with the throttle body, such as sticking or a faulty stepper motor. 4. Catalytic converter blockage: There might be an obstruction in the exhaust system or at the connection points. 5. Electrical circuit issues: Open or short circuits, or poor conductivity in the electrical system (e.g., ignition coil, spark plugs, wiring).