The car can't idle at low speed, sometimes it turns off and can't add the throttle. What happened?

The vehicle has low idle speed and insufficient power. Common fault points are:

It may be that the throttle of the engine is too dirty or faulty. You can clean the throttle first. If the fault still exists, it is likely that the throttle valve is damaged.

The spark plug is damaged and the spark plug gap is worn, which leads to insufficient ignition and insufficient combustion of mixed gas, which leads to accelerated jitter. The ceramic part of the spark plug has cracks, which leads to the ignition failure of the spark plug and the failure of one cylinder, which also leads to accelerated jitter.

Poor gasoline quality leads to poor atomization effect of fuel injector, and insufficient combustion of mixed gas in cylinder will also lead to idling jitter. It is recommended to use high-grade gasoline after using this box of gasoline and do a fuel system cleaning.