Righty where do i start.....replaced the 1.3ltr with a 1.6ltr engine. had to swap a few things over but no big deal. it started first go but was running rough (really rough engine shaking rough). Revved it a bit and it purred whilst at revs, once set back to idle it runs rough as guts again. whilst running i can remove 1 & 3 spark plug leads and the engine still runs rough. however if i remove 2 & 4 then she stops dead and will not start. From what i can gather all the pulses are meeting the injectors on all 4 cylinders. Is it the ECU has that chit itself....or is there anything else i can try...getting frustrating when everything else is running great but the idle (which is kinda important). if anyone has any ideas about this please respond. All the compressions are good, the valves good, valve spaces good, spark plugs good, fuel ignitioin puls (seems good), fuel pump good, spark plugs firing, timing good, and just about evreything i can think of...help