What are the symptoms of a dirty car air filter?

[Roy]

If the air filter is dirty, the air intake will be insufficient, leading to incomplete fuel combustion, which causes unstable engine operation. When continuously pressing the accelerator pedal, the engine sound becomes muffled, acceleration response is sluggish, operation is weak, and the exhaust is thick and black. The replacement cycle of the air filter depends on the car's usage and surrounding environment. Under normal driving conditions, the air filter should be replaced every 15,000 kilometers. If frequently driving in poor environments, the replacement cycle should be appropriately shortened, not exceeding 10,000 kilometers. It is advisable to develop a habit of regular inspection and timely maintenance. The car air filter is installed in front of the carburetor or intake pipe to filter the air entering the engine. During operation, the engine inhales a large amount of air, which contains many dust particles. Without air filter filtration, it will accelerate the wear of the piston group and cylinder.