Is the noise from the exhaust pipe of Angkor Sela normal?

This is the engine idle state without jitter, accompanied by the exhaust pipe "sudden" sound, and even signs of flameout.

1, tubing A, tubing blockage, poor patency, rail pressure, etc. B. The electric fuel pump is abnormal or the fuel filter is blocked or blocked for various reasons; C. Abnormal choke: It can be due to its own quality failure, or it can be due to various defects such as foreign body blockage, poor sealing and rubber ring aging.

2, air intake or idle speed control A, stepper motor, throttle body dirty or air leakage. Sensors such as air pressure, temperature and throttle position are abnormal, and the data is incorrect. B, too thin: the mixed gas is too thin or the fuel is too thin and other comprehensive problems. Check the air intake part, oil circuit, etc.

3. Presbyopia or cracking of the ignition wire leads to electric leakage and insufficient ignition intensity. Or installation problems lead to poor contact. Suggestion: Replace the original ignition wire.