What is the reason for the high and low when the overbearing 4000 is idling?

First, the stolen goods produced in the air and the sludge produced by gasoline are likely to cause the vehicle throttle to be too dirty and the idle motor to work poorly. Second, excessive carbon deposition can easily lead to lax valve closure, poor atomization of fuel injectors and insufficient combustion. Third, the exhaust pipe is blocked, resulting in poor exhaust. Reason 4: Air leakage leads to insufficient vacuum. The fifth reason is that the circuit is aging and the computer board is broken, which is not easy to appear in the short term. Car owners are advised not to easily install other equipment for their cars. Reason 6: Insufficient cylinder pressure and natural wear will not appear in a short time. The maintenance master hereby advises the owner to maintain and clean the car on time. Under normal circumstances, it is cleaned every 20,000 kilometers. If you find idling problems, try to avoid going to roadside shops for maintenance. You should go to a regular 4s shop for inspection, because the master in the shop knows the characteristics of these cars best and has rich experience.