What are the reasons for a car's weak acceleration when starting?

[IslaMarie]

The reasons for a car's weak acceleration when starting are: 1. Carbon deposits in areas such as the valves, idle speed motor, intake tract, combustion chamber, and spark plugs; 2. Driving in congested roads, where the car frequently accelerates and decelerates, can lead to a weak feeling when driving again; 3. Poor fuel quality can affect the gasoline filter and fuel lines, possibly causing inadequate fuel supply and resulting in weak acceleration; 4. A clogged three-way catalytic converter directly impacts the vehicle's acceleration performance and can also increase fuel consumption, leading to weak acceleration when starting.