What's wrong with the exhaust of automobile throttle?

The causes of air leakage behind the throttle are: 1, and the tank ventilation valve is in a normally open state; 2. The intake manifold is cracked; 3. The throttle gasket is damaged; 4.DME seal has a problem; 5. There is a problem with crankcase ventilation; 6. The engine body leaks air. ?

There is a leak in the air intake system, which causes the engine control unit to light the EPC warning light after detecting the problem. This situation can also be extended to the situation when the engine is started. Do not pull out the fuel gauge or open the fuel filler cap. The engine controller will misjudge the air leakage at the engine air inlet, and at the same time, it will also cause a fault, which will lead to the EPC light being on and the engine shaking. If there is a leak in the crankcase ventilation system, this fault may also be caused.