What are the symptoms of mismatched spark plugs?

[JuliannaMarie]

Symptoms of mismatched spark plugs include engine idle shaking, difficulty starting the engine, and weak acceleration. Engine idle shaking: If the engine shakes while idling, it could be due to faulty spark plugs, disconnected cylinder wires during spark plug replacement, or mismatched spark plugs. Difficulty starting the engine: If the engine requires multiple attempts to start and stalls more frequently while idling, it may be caused by mismatched spark plugs. Weak 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 acceleration feels weak and fuel consumption increases, it is likely due to spark plug issues.