nice.
pictures will be nice. hehe.. 
jerking like gearbox jerks or jerking like not enough fuel or air?
i guess its like the engine not getting enough fuel or air.
this is tricky coz u change/service a lot of things sekaligus..
maybe ur AF ratio is disturbed. go to any proton service centre and ask them to retune back the ECU to get optimum AF ratio back.
or u can check the airflow sensor, sparkplug and spark plug cable to see if its working ok..

Hi do u all have black oil leak issues ? My perdana V6 2000 have damn alot leak issues zz ... send for workshop few times edi and did not solve the problem either do u all know whats wrong  ?

Thanks will try it out. Which workshop do u all normally go to ? Can recomand any workshop reliable with reasonable price and knows how to deal with perdana v6 cars =) ? Wanna do some mod on it too =D