What's the reason when a car suddenly stops moving?

[Liam]

The reasons why a car suddenly stops moving are as follows: 1. Clutch: When you press the accelerator, the engine speed increases, but the car doesn't move, indicating a problem with the clutch. 2. Fuel supply system: When you press the accelerator, the engine speed does not increase, indicating that there is no fuel injection, which could be due to an issue with the fuel supply system or the throttle cable. 3. Intake system: When experiencing weak acceleration, check if the intake system is intact. If it is intact, consider whether the intake system needs cleaning. Remove the air filter and blow out the dust; if it's difficult to clean, replace it. Check if the throttle body is clean, and further inspect the intake valve and intake manifold. Clean them if necessary. After inspecting and cleaning the intake system, if the acceleration is still weak, it can be concluded that the issue is not related to the intake system. Idle shaking can be resolved by cleaning the intake system.