Do you need to clean the nozzle, throttle and air intake system for Jetta's 30,000 km maintenance?

It is recommended to clean the lower throttle and air intake system.

The throttle is generally cleaned every 20,000 kilometers or so.

Dirty throttle will lead to vehicle idling jitter and driving jitter.

Engine intake system is generally cleaned once every two years, or about 4 wk.

The engine intake system is too dirty, and the vehicle has problems such as weak acceleration and increased fuel consumption.