hi can anyone help me figure out why my car will only run with the vac valve that connects on the top of the engine by spark plug #3 disconnected. if I put it back on it just stalls. I have just changed the injectors for new ones exactly the same not uprated and also fitted new spark plugs. with the vac pipe off the car runs and drives fine but if I connect it it stalls straight away any help would be great thanks
oh just to add to this I also did the air box mod at the same time! and the car is an 04 plate megane 225
