Common faults of Avio throttle

Hello, what is the common fault of Avio's throttle? The common faults of Aiweiou throttle are unstable idle speed of engine and setback of gearbox. Aiweiou is a very distinctive model of Shanghai GM Chevrolet, with two models: hatchback and sedan. The common faults of throttle valve are unstable idle speed of engine and frustration of gearbox.