Why does the car occasionally shake at idle speed?

[OJaxon]

Car occasionally shaking at idle speed is mainly caused by the following reasons: engine carbon deposits, aging or carbon deposits on spark plugs, dirty engine throttle, and poor fuel flow. Here are more details on the solutions: 1. Clean carbon deposits from spark plugs or replace them with higher-quality, more expensive spark plugs. 2. If the center electrode of the car's spark plug is made of nickel alloy, it is recommended to replace it every 20,000 to 30,000 kilometers. If both the center and side electrodes of the car's spark plug are platinum or iridium, it is recommended to replace them every 80,000 kilometers, and clean the carbon deposits from the spark plugs when necessary. If only the center electrode of your car's spark plug is platinum or iridium, it is recommended to replace it every 40,000 to 60,000 kilometers.