How to remove the intake manifold of Grand Cherokee v6? Why is the intake pipe broken?

1, the screw can be removed, and the spark plug is not easy to use; Vacuum tube leaks; High-voltage line leakage; PCV valve is blocked; Throttle position sensor.

2, the stepper motor idling fault; Idle speed control valve is faulty; Abnormal throttle opening; Air intake system leaks. When idling, the engine shakes and the speed is uneven. The reasons are: the idle air metering hole is blocked, the idle device is not working normally, the spark plugs of individual cylinders are too weak, the seals of individual valves are not tight, the intake manifold leaks air, the ignition time is too early or too late, and the idle speed is not adjusted properly.