:| Hi everyone........I have just been checking up on things that I need to do for my servicing and I found a link that discussed the using of injector cleaner and that it should never be used because it can damage the linings I used some fuel system cleaner which includes the injectors and Lambda etc approx 1000 miles ago so am I waiting for my engine to die or would it have shown up by now? I have a slight stutter/misfire which seems to be getting slightly worse which an ex ford mechanic that I know said it would probably be the coil pack as he had to replace loads of these when working for Ford and still does or check the plugs which I planned to do as part of my service but at that time I didn't know about the problem with using the cleaner.....Am I being paranoid or could I have a real problem?? Hopefully it will be ok as I love my Puma. Also whilst I'm here are Bosch spark plugs or NGK ok as replacement parts? Thanks for your help!!!!!