A misfire on an engine can cause catastrophic failures if left unrepaired. Running an engine with a leaky injector can cause too much fuel and wash out rings. One not firing can cause a lean condition and cause detonation. My daughters 2007 Cadillac with a 3.6 VVT engine had a misfire in #1 cylinder. How did I know? Most shops and/or Autoparts stores will put a scanner on your car for free it hopes of selling you parts or service. Once you pinpoint the problem the rest is easy. I tried changing the spark plugs first to no avail. You would think I would have learned by now since I had a Toyota MR 2 Do the same thing and it was the injector (see changing injectors on Toyota 2.2 video). On this car, the labor is so involved that this time I chose to do the injector and coil just to be sure I got it fixed. I should have done this when I did the plugs six months ago, but hindsight is 20-20 (see changing 3.6 VVT spark plug video). Nonetheless, in spite of my poor camera skills, you now have a fairly in-depth video on changing both the coil and an injector. Watch as I walk you through process from start to finish and eliminate the misfire that endangered the longevity of this engine.
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Good thing you can do it, I personally hate the newer vehicles, but I have had to work on my mother's Nissan and it's a complete pain in the butt