Free car maintenance information Sonata VIII has no idle speed.

If the engine can still start and run normally when stepping on the accelerator, and the engine will turn off when releasing the accelerator, then it is obvious that the engine is not idling, mainly because there is a problem with the engine idling control system. Therefore, it is recommended that you focus on checking whether excessive carbon deposition in throttle and idle valve causes idle airway blockage. In addition, the idle control valve itself may be degraded or damaged. If there is too much carbon deposit at the throttle valve and it is cleaned in time, the above undesirable phenomenon will be obviously improved. To sum up, according to the above analysis, combined with the actual situation of the vehicle, I suggest you go to a special shop for further on-site inspection and judgment.