What are the symptoms of a faulty Focus intake manifold control valve?

[LaLiam]

When the intake manifold control valve of a Focus is damaged, it will cause air leakage, resulting in reduced gas pressure. This leads to weakened intake capacity, decreased engine power, insufficient air intake, and increased carbon deposits. Below are the functions of the intake manifold control valve: 1. The intake manifold control valve is used to control the length of the intake manifold: When the engine is idling, the intake pipe is lengthened to facilitate increased vortex flow, stable intake, and smooth idle operation. 2. The engine can fully intake air: At high engine speeds, the intake manifold air path is shortened, allowing a large amount of air to enter easily, enabling the engine to fully intake air.