What happened to the sudden high speed of 20 17 manual sagitar shift?

Hello! The engine can normally run at a fast idle speed when the car is cold, but it still keeps a fast idle speed after the car is hot, resulting in a high idle speed. Reason for failure 1. Throttle stuck or not closed correctly. 2. Improper idle speed adjustment. 3. The additional air valve is faulty. 4. The idle speed control valve is stuck or the control circuit is faulty. 5. The coolant temperature sensor is faulty. 6. Air conditioning switch and power steering gear pressure switch are faulty. 7. Malfunction of the positive crankcase ventilation valve. 8. Air leakage in the air intake system. 9. The generator charging voltage is too low.