mudasr: i dont know how much you manage to chk on your own, i would basically start with 3 things first.
- air
2.fuel
3.electrical
the airfilter to be checked if its not clogged, air flow to engine all in good condition.
for fuel chk fuel filter, injectors and fuelpump,, here we also clean throttle bodies as and whenever required especially in Pk air is very dusty..
spark plugs, should be in good condition.,, change them if possible.. plug wires to plugs and distributor should be all intact, secure no broken tips.