@Xulfiqar
i got my carb cleaned a week back, Earlier the car wasnt even driveable on petrol, but after cleaning it was smooth as butter, after that it remained with me, i had been driving it at low rpm for a couple of days (60 @ 4th gear). but the drive seemed to be getting worse each day. the jerking came back and the idle became abit erratic. i tried an italian tune job and could see black smoke in my rear view (it was gone after adjusting mixture so it isnt the engine).
The guy who worked on the carb asked us for it's genuine jets (we had kept them safe with us). Today we went back and got those jets installed, no change, absolutely.
At idling the rpm was dancing between 550 and 800, while this engine is supposed to idle around 700 rpm.
another issue is that the car takes a hiccough when i press the accelerator (i mean the rpm drops, then the car takes a jerk and starts accelerating). Please tell me which parts to check, i am getting sick of tukka baazi
btw in the morning i can see the exhaust emitting smoke like a gun, it spits like once every second when its cold, though this issue is pretty reduced when engine is warmed up