What are the symptoms of a throttle valve malfunction?

[StTalia]

Throttle valve malfunction symptoms 1. Unstable engine idle: The engine idle is unstable, high idle speed persists and does not decrease, the engine is difficult to start, especially cold starting is difficult. The engine idle is unstable or there is no idle. Use a fault diagnostic tool to perform a throttle valve check, observe the data stream, and clean the throttle valve if the opening is too large. Generally, replacement is not necessary unless there are permanent fault codes. 2. Engine starting difficulty: If the throttle valve fault is determined to be permanent after inspection, the throttle valve must be replaced. 3. Insufficient engine power: Poor engine acceleration performance and unstable operation. Replace the throttle valve. The throttle valve is generally not repairable and should be replaced as an assembly.