PFR6G-13 is the stock plug for all B-series VTEC motors. You have to gap them down to 1.0 mm from the preset gap of 1.3 mm. Basically the 6 in the part number is the heat range and the 13 is the gap. You can run an equivalent copper plug with no ill effects aside from having to replace them more often than the stock platinum ones. If you still have the box for your Bosch plugs then you can check to see what heat range they are. If they're not a 6 heat range plug, then you know where your problem is.
Plug wires that have too high a resistance may indeed cause your plugs to foul so that is another possibility. I don't really trust APC products myself. If you switch to stock wires and either the NGK PFR6G-13 (platinum) or BKR6E-11 (copper) plugs you should hopefully not have any more issues. The platinums are usually about 10 bucks a pop and the coppers are about 2 bucks a pop so you may want to go with the coppers as long as you remember to replace them every 15k miles.
Originally Posted by Ramman949
is that a full size chevy your standing next to?
Hahaha, that's not me in my avatar. :chuckles: