What are the symptoms of air leakage from the air filter to the throttle connecting pipe of the old Bora car?

When you talk about air leakage or airflow noise, there is generally no stable idle speed. If there is air leakage before the throttle, it should be said that it has little effect. As long as the clamp is tightened to find the air leakage point, unfiltered air can be sucked in at most, which may cause unnecessary wear and tear to the cylinder and piston for a long time.