What are the symptoms of faulty car spark plugs?

[JaxsonLynn]

Car spark plug failure symptoms: poor engine performance, including difficulty starting, unstable idling, poor acceleration, backfiring during sudden acceleration, excessive exhaust emissions, increased fuel consumption, and other abnormal phenomena. Solutions for car spark plug failure: 1. When removing the high-voltage wire connector, do it gently and avoid forcefully shaking the spark plug insulator, as this may damage the spark plug's sealing performance; 2. The area around the screw, spark plug electrodes, and sealing gasket must be kept clean, dry, and free of oil stains; 3. The engine must be cooled before removal. After loosening the spark plug to be removed, use a thin, soft tube to blow away any dirt around the spark plug to prevent debris from falling into the combustion chamber when the spark plug is removed.