Originally Posted by
Davemurphy007
I then remove injector number 1 and swap it for injector number 3 - the car still runs on 3 cylinders so it's not a fuel problem and removing HT lead 1 doesn't change how the engine runs, removing HT lead 3 takes the car down to 2 cylinders.
Just swapping injectors won't prove anything if the fault is with the feed (fuel or power) to the injector as nothing will change. You need to make sure the injector is getting power and that it's actually injecting fuel before you rule it out.