Shahid sab.. Ye Masla ziada Tar Santro vehicles k saath hai .. but sab k saath nahi hai .. bcoz ... ye Problem IAC valve also called Actuator and choke sensor. and it could be resolved if you find the OEM IAC. ya Kabli one. But kabli ba mushkil hi milta hai original condition mai.. mostly cracked or damaged miltey hain . .or wo bhi expensive.
AGr srf AC ON krney par hi horha hai to .. You need yo service it once. with Throttle Cleaner. You will find the difference.
knocking ka Hal ye hai k jab Petrol End hojaye Almost tab Hi-Octane fill kren Maximum 10 Liter.. and consume it .. then jab end k Qareeb ho to 10 litre super.
or Bhai Jhankaar ka kuch idea nhi hai .. k Kahan se arhi hai .. exactly