Where is the ventilation device of Chery A 1 crankshaft?

After listening to your account, I feel that it is really a problem with the crankcase forced ventilation system. It may be that the positive crankcase ventilation valve is blocked. Generally speaking, the positive crankcase ventilation device is recognized. Generally located not far behind the throttle, one end is connected behind the throttle and the other end is connected to the valve cover. The pipe diameter is about 2-3 cm. This is a water pipe. You can pinch it. When idling, you can hear a rhythmic click when you pinch the hose.