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Been going through the steps on figuring out what exactly could cause a misfire in a 90 Z32. So far I narrowed it down to Cylinder #3 . at first thought it was the coil pack, (disconnecting it did not change the way it ran. )Ended up switching it with another coil pack that is running but nothing changed. Next I removed the spark plug in cylinder #3 thinking it could be the spark plug it self. Taking out the plug I saw it was all black looking burnt which lead me to believe that cylinder is running rich being caused by a faulty fuel injector.I did switch spark plug ( which are NGK ) with another cylinder to see if maybe that plug would misfire in another cylinder, it didn't. So faulty injector? Has anyone heard or experienced anything else that it could be. Haven't had the car for long, plugs have been recently changed by last owner. Car idles around 1ooo. I did some reading for about a week before posting and diagnosing the problem. Haven't pulled codes yet though that should've been my first step. I'm new to Nissans or V6 ( vg30 ) always had Rotary's. Hopefully I can figure this one out. Thank you.