I have a problem, My 92 tsi is running on just 3 cylinders. I replaced the plugs, then replaced the wires, then the coil...still 3 cylinders. When i pull one of the wires off the plug while it's running it doesn't change the sound or how it's running at all, which led me to beleive that it was a spark issue. Now, just for fun I pulled that same wire again, stuck in an old spark plug, started the car and lots of spark was comming off that plug. So now I think it's fuel, a bad injector maybe, but even if that is the case, why doesn't it sound different when I pull that plug wire off?? Unless there is absolutly no fuel at all coming from that injector. Can an Injector completly stop spitting fuel??