seems you have carburator 2E type engine in your car, if it also has cng installed then its related to running on two types of fuels even you use petrol ,, LOGAS can help you better.
or if its carburator jets related,, maybe blueanwer can suggest something..
as for me i ve forgotten carburators because i havent used carburators in long time
my experience in replying to questions is related to owning a type of car at a given time and current issues going on with it or if i remember something similar issue i had or seen in past.
its ok to post a techinical question , some one will guide you soon.