How to repair the high pressure before throttle of Jiefang 470 gas vehicle?

1 and jiefang 470 gas vehicle need to check the air intake system first, including cleaning the throttle valve, checking the air specification, and checking whether the vacuum tube falls off or leaks.

2. Then check whether the high-voltage line, spark plug, ignition coil and ignition timing are normal. As long as the ignition timing meets the engine working requirements.