hiya guys.... just bought my rs turbo s2 recently and the previous owner didnt tell me when the tank shows a quater its empty lol. so i ran out of petrol put some petrol in then about 20 yards away it cut out.... everytime i try to start it it runs for a second and cuts out....now if i press the gas down to full it will run like its on 1 cylinder and back fires with black smaoke. what could it be...? dizzy cos its held together with a cable tie and we messed with it, air/fuel mixture, injectors? any ideas?