What are the symptoms of mismatched spark plugs?

[Freddy]

Symptoms of mismatched spark plugs include engine idle shaking, difficulty starting the engine, and lack of power during acceleration. Engine idle shaking: If the engine shakes while idling, it indicates a problem with the spark plugs, such as disconnected ignition wires or mismatched spark plugs during replacement. Difficulty starting the engine: If the engine requires multiple ignition attempts to start and stalls more frequently while idling, these are signs of mismatched spark plugs. Lack of power during acceleration and increased fuel consumption: Generally, after replacing spark plugs, the engine should run smoothly with strong acceleration and ample power, while also improving fuel efficiency. If the vehicle lacks power during acceleration and fuel consumption increases, it is likely due to an issue with the spark plugs.