AOA guys, i have city 08, 43k driven, used sparingly and v. carefully. all maintenance etc is c/o regularly. however, since the onset of this winter, the car is giving jerks on lower gears. in fact the issue got my notice when i started driving it on patrol. (this issue is not there on CNG, but now as CNG is not available, its driven on patrol). additionally, rough idling is also there. got the car tuned, tappets adjusted, plugs gap checked etc but not much help and not satisfied. mechanic checked and declared fuel pump weak. it may be but i believe that on lower RPM, even weak fuel pump gives enough fuel supply as the req is quite less. however, advise/ suggestions are requested in this regard. plugs etc are all new, air filter is clean, engine oil is fresh. and the car gives excellent mileage on CNG as well as on patrol. what do u guys suggest?