it seems there a small screw back of the intake but the idle is control by the ecu.
I had the same problem and it turned out to be the fuel purge censor
When a car, such as a Hyundai accent, has and broken idle control valve the engine may or may not start. Idling is controlled by this part and the car a malfunctioning unit can cause the car to act erratically, such as starting at random times and stalling.
Because the engine is running. Shut it off or give it gas and it will not idle.
It is just next to the TPS (Throttle Position Sensor) on the intake manifold.
idle speed controll or tps throttle sensor
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A bad idle air control sensor or a bad throttle position sensor.
how to adjust idle on 2001 legacy
Why does my 2001 kia sportage idle rough?
its probably your TPS Switch or your idle control sensor, check engine light will not come on for either take to Hyundai dealership
The idle is computer controlled