Thanks guys. I found a place with the same spark plug, so I'm on the way to get that and try it out. The plug basically looks the same as all the other plugs that I pulled out & cleaned a couple months ago (although back then they all had a little more black film on them due to not being changed in years). About 10 years ago my fuel injection guy said he tuned the car to be a little rich so I wasn't really surprised with darker plug endings when I checked them all & cleaned a couple months ago. But who knows, I will know for sure when I get a new clean plug in. As far as testing a faulty injector, all I know how to do is to maybe listen with my stethoscope on the injector or maybe also feel the injector to see if the feel or noise is any different than the others, no? Probably will pick up a new plug wire too in case I want to be sure the wire to that plug isn't faulty. Although that will be a pain in the crotch to try and reach back there without going in the other way by the seats.