Changing the timing belt will lead to unstable idle speed of the car. How did this happen?

Changing the timing belt will lead to unstable idle speed of the car, and the throttle needs to be matched after replacement. After the engine changes, it is necessary to calibrate the throttle position, otherwise the idle speed will change. The specific operation steps of throttle matching are as follows:

1. Connect the computer signal transmitter to the vehicle OBD interface.

2. Click Auto Test, and the computer will automatically input the corresponding vehicle type.

3. Select the engine control unit.

4. Click the electronic throttle body option for matching operation.

5. At this time, the engine idling is normal and the matching is completed.