Cruze valve cover is broken. What are the performances?

The damage of Cruze valve cover chamber shows that the damage of Cruze valve cover leads to unstable idle speed. When the engine is idling, the throttle position sensor shows that the opening is 1%, which is inconsistent with the speed. Air enters the engine from other ways. You can hear the sound of air leakage from the valve cover. Upon further inspection, it will be found that there are two small ventilation holes on the valve cover corresponding to the crankcase ventilation pipe, which are hissing and leaking air. Precautions for replacing the valve cover are as follows: 1. When replacing, thoroughly clean the contact surface. Stick if you can, because it takes a long time, and it is ok not to stick, depending on the owner's own wishes; 2. The engine must be completely cooled before it can be replaced; 3. When installing the valve cover, tighten it diagonally several times. Is to fix a screw and then fix it diagonally. This can prevent uneven stress on the valve cover pad.