What is the solution to the unstable idle speed?

Idle speed is unstable, high and low. Solution: 1 Oil change: When there is a problem with the idling speed of the vehicle, the first thing to look at is whether it is time to change the oil. Change the oil in time, or the engine will be abnormal if it takes too long. Pay attention to the choice of engine oil. High-grade engine oil, such as SJ grade or above, has better quality and good performance in all aspects. 2. Look at the antifreeze in the water tank: the antifreeze in the water tank should also be checked more, neither less nor more, otherwise it will affect its effect and cannot play a good role in cooling the engine. Pay attention to antifreeze. Generally, a new car needs to be replaced every 2-3 years or 40,000 kilometers. According to the temperature in the area, choose the antifreeze with appropriate freezing point, such as-25 for the antifreeze with the lowest ambient temperature of-10; 3. Check the engine: If the idle speed of the vehicle is not the problem of oil and antifreeze, check the engine to see if there is anything wrong with it.