[trikey]

Originally Posted by Rsnail

I've thought in the meanwhile of more things that could cause the matter: O2 sensors, lambda sensor, maybe even timing issues, but the O2 sensors should affect one of the engine banks that they're responsible for I guess and the latest issues I mentioned should make the whole engine misfire in a matter and make it run a little rough I guess, but neither should affect only one cylinder I suppose...

I have never known a faulty injector on the petrol engines, have a look at the O2 sensors and their wiring first.