What are the symptoms of throttle leakage?

Hello, this throttle is leaking. First of all, you have to see whether the throttle leaks before or after. If the front of the throttle is leaking, you can find that the data fee of intake air flow is very small by reading the data flow. Its effect on our engine is unstable idle speed. If there is air leakage behind the throttle, the idle speed is high. I hope it helps you.