What is the cause of acceleration weakness in the 2013 Jetta?

[LaElizabeth]

Acceleration weakness is caused by carbon buildup on the valves, intake tract, combustion chamber, and spark plugs. There are three key points for engine maintenance: 1. Clean the air filter: The air filter is crucial for engine air intake during driving. If the air filter becomes clogged or accumulates excessive dust, it will restrict engine air intake. Additionally, large amounts of dust entering the cylinders will accelerate carbon buildup, leading to poor engine ignition, insufficient power, and naturally increased fuel consumption. 2. Remove throttle valve sludge: Sludge forms due to carbon deposits from fuel combustion exhaust at the throttle valve, as well as impurities not filtered by the air filter accumulating there. Excessive sludge creates air resistance in the intake, resulting in increased fuel consumption. 3. Clean injector carbon deposits: Since the combustion chamber is prone to carbon buildup, which can cause starting difficulties, injector carbon deposits can also lead to fuel passage blockage, distorted fuel injection, and poor atomization, naturally increasing fuel consumption.