When a car does not accelerate despite the engine revving up normally, it indicates a problem in the power delivery system. Several factors can contribute to this issue. Here are some possible causes;

1). Clutch Issues: In a manual transmission car, a worn clutch disc can prevent power from transferring effectively between the engine and the wheels. This can result in the engine revving but the car not accelerating.

2). Transmission Problems: In an automatic transmission car, issues with the transmission can lead to a lack of acceleration. Worn transmission fluid can cause the engine to run roughly or fail to respond when the gas pedal is pressed. Additionally, problems with the valve body, clutches, bands, or regulator can also affect power delivery.

3). Incorrect Air/Fuel Ratio: If the engine is still sluggish despite ruling out transmission problems, the issue may lie in the intake or fuel injection systems. The proper mixture of fuel and air is crucial for combustion. If the air filter or sensors are malfunctioning, the engine may not receive enough air, resulting in poor acceleration. Clogged fuel injectors or a faulty fuel pump can also lead to insufficient fuel supply.

4). Throttle Body Malfunction: In newer cars, the throttle body controls the amount of air sent to the engine based on the gas pedal input. Over time, carbon deposits can build up and cause the throttle body to become stuck. This restricts the airflow, leading to decreased performance and acceleration.

5). Malfunctioning Engine Control Module (ECM): If all other possibilities have been eliminated, it may be necessary to have the vehicle’s ECM or ECU checked by a technician. The ECM controls various aspects of the engine’s performance, and a malfunction can affect acceleration