@aantherax
Thanks dear for the advice....here is what i did today
Cleaned the plugs they were rust coloured and no carbon...still cleaned them
Found throttle body/sys on left of airclaner and opened and cleaned it had quite some carbon so i washed it with petrol...
tyre pressure is 30 and do not intend to inc or decrease it
lastly one more thing i discovered that air intake pipe of air cleaner doesn't give any suction on idle or even with some RPM.....this came as a mystery to me....my next mission is to find out if it a design perimeter or air is directly going in from some other point....may be air cleaner did fit back on its seat....