When parking in the power-assisted direction, the idle speed becomes lower, and the engine mixing jitter is large.

When parking, the car engine runs at idle speed.

When you hit the direction, the steering booster pump starts to work, the power consumption of the car increases, and the engine load increases, resulting in insufficient output power and engine jitter.

You can adjust the idle speed of the engine properly, or you can clean the throttle and replace the gasoline filter and air filter.

If the car is old and you don't want to spend money, just keep up with the accelerator when you hit the direction.