Have a on going problem with my 4x4 saph, the car is acting funny and the problem seems to keep changing. It used to be a bit hard to start but once started it started straight away again, now the car has decided to really act up. The car is currently off cylinder no4 and when you remove the plug lead the car stops, doesn't do this with the other 3 leads. There is spark at no. 4 though but when you unclip no 4 injector it seems to make no difference but when you put it back on again you'll hear it pulse for like one cycle, other prob I found is at the map sensor plug I get 2 feeds of 5v when ignition is on. Anyone any ideas on what's going on? Bad chip perhaps?