hi im haveing a lil problem with a mb sprinter 903 chassis. it has white smoke, missing when u come to a complete stop and try to move off again, holds back when u put your foot down. i have changed all four injectors on it and this has same problem. i have plugged it into my mercedes star machine onto it and comes up with no fault or what so eva. i even checked the live data and everything is in working order. can some one please help.