XCENT MISFIRE PROBLEM, What causes engine RPM to fluctuate?

This is a problem that relates with the engine rpm fluctuations, it also effect engine efficiency.
Root Cause of this problem is dusty throttle body.
Solution of this problem is dismantle the part and clean it with patrol.
Is it normal for RPM to fluctuate at idle?
Why is my RPM stuttering?
Why is my RPM jumping while in park?
Can bad spark plugs affect RPM?
What are signs of a bad ignition coil?
What are signs of a bad spark plug?
How do I know if my spark plugs need changing?
How often should you replace your spark plugs?
What does a misfire sound like?
How do I know if my spark plug is misfiring?

[@sumansharma-de8to]

sir mere fiat punto petrol ma suba start nahi hoti aur rpm up down hota reheta hain aur gadi bar bar band ho jati hain

[@SethiMotorsWorkshop]

Plz service throttle body service..
Phir bhe dikkat hai to plugs and ignition coil check krvao..