Why does the car feel slower after changing spark plugs?

[SanWilliam]

The reasons why the car feels slower after changing spark plugs may be: The spark plugs are not tightened properly; The replaced spark plugs are of the wrong model; There is an issue with the ignition coil. What are the effects of damaged spark plugs: If the spark plugs are damaged, it can directly cause leakage in the vehicle's ignition system, increased fuel consumption, reduced power, and many other issues. The most significant problem is difficulty in ignition, affecting the normal use of the vehicle. Severe erosion of the spark plugs, such as scarring at the top, damage, or melted and eroded electrodes, indicates that the spark plugs are damaged and should be replaced. How to determine if spark plugs are damaged: Remove the spark plugs and observe their appearance to judge their condition based on the following color observations. Normal spark plugs have insulator skirts and electrodes that appear gray-white, gray-yellow, or light brown. A properly functioning spark plug has a reddish-brown insulator skirt, with an electrode gap between 0.8-0.9mm and no signs of electrode burn.