I have Nissan Dayz 2013.
My car was not picking up, when i throttled alot of sound from engine and hardly picking up.
The mileage was satisfactory, 16-17 in long 12-13 in city with ac.
But with ac it was hardly running.
Today went to my mechanic.
Iknew the faults, i didnt asked my mechanic to drive.
I told him to open plug, filter, injectors , cat converter, throttle body.
The CAT was blocked.
Rest all was in good condition ( near to new).
After the work done, the car is running like a champ.

Attaching pics.

The falooda showing in pic , which came out from Cat. Please multiple it by 3. that was the total amount came out.
Sharing the experience as i see mosty people facing the same issue.
Regards