What is the unstable idle speed?

Different cars have different detection parts.

Take Jetta Santana as an example, focus on checking whether there is air leakage in the throttle and air intake system. Clean the throttle valve if necessary, and then make the basic setting of the throttle valve.

This failure of domestic mini-car has something to do with throttle body and engine computer. Check whether the throttle seal is intact and whether the idle motor works normally.