What is the perfect solution to idle jitter of Prado 2700?

The perfect solution for idle jitter of Prado 2700 is: 1. Clean the oil circuit and throttle valve; 2. Check whether there is too much carbon deposit in the spark plug and replace the spark plug; 3. The ignition system is not working properly; 4. The oil pressure is unstable. The reason of idle jitter of Prado 2700 is that the throttle valve is too dirty or the injector has too much carbon deposit. When there is too much carbon deposit in the engine, the gasoline sprayed by the injector will be absorbed by a large amount of carbon deposit during cold start, resulting in dilution of the mixture during cold start. The length, width and height of Prado are 4840mm, 1885mm and 1890mm respectively, and the wheelbase is 2790mm. Equipped with a 6-speed automatic manual transmission. The maximum torque of the engine is 365 Nm, the fuel tank capacity is 87L, and the maximum speed is 175km.