Suggest to diagnose at workshop, usual keypoints of diagnose are:
1. Check the throttle body, clean or replace it.
2. Usually there are very less cases that the throttle body needed an replacement, most of the time a dirty throttle body will require a clean up only.
3. In most cases, throttle body should be cleaned at an interval of 20k kilometer - 40k kilometer. If your car is use in a more severe environment, can shorten the throttle body cleaning interval.