Road side Mistery walon ke liay ye gaari wakai azaab hai.
Bhai aap aik kaam karo aap thoray dino key liay Suzuki Mehran ya Alto rakho, inn ki Drive bhi buhut zabardast hai tractor ki tara aur ye apney parts 100,000 kms tak araam se chala leti hain, wah re ustaad wah.
No need to change its throttle body, ask your Professional mechanic check for any vacuum / air pipe leaks.
If its not the problem then simply try resetting your car's ECU:
ecu reset please
Its simple and easy.
The third step is to go to the Dealership and spend some money because its not a Mehran.
Edit: Sorry this is the correct link: