Originally Posted by EludeR
I would say so, it's definetely fuel related. I would have another tuner look it over imho. if your AFR isn't rich (at any point in given time), then you wouldn't have all this carbon buildup on your plugs.
This is VERY true. I know I'm far from you but, if you want, come take the trip I'll put my wideband in and check your A/F ratio's out for free.
-Pete