Why does the car feel sluggish in acceleration and the throttle becomes heavy?

[JasmineLynn]

Car feeling sluggish in acceleration and the throttle becoming heavy is mainly caused by excessive carbon deposits in the engine. It is necessary to clean the throttle, check for carbon deposits in the fuel injectors, and inspect whether the spark plugs are functioning normally. If the spark plugs are aged, they need to be replaced. For both automatic and manual transmission cars, it is recommended to maintain a steady speed under the same road conditions, as this helps in saving fuel. During car maintenance, attention should be paid to details, such as timely cleaning of carbon deposits in the fuel injectors. The engine, throttle, and combustion chamber are all prone to carbon deposits, which requires the owner to perform timely vehicle maintenance and regular cleaning to extend the engine's lifespan.