What is the reason why Peugeot 308 can't start the throttle shift?

The reason why Peugeot 308 throttle can't be started is that the throttle has carbon deposit, so it needs to be replaced. Check the wiring first, because the plugs of throttle and ignition coil are inserted backwards. Attention should be paid to the cleanliness of the engine air inlet, and the air filter should be replaced as required to reduce carbon deposition at the throttle. When cleaning the carbon deposit on the throttle, it is also necessary to avoid the impurities that have been cleaned from affecting the operation of the throttle.