Correct me if im wrong, but I think ive seen a few references to a destroyed electrode on the plug in #2. Everyone says to change the plugs, but if #2 is failing more than any other, wouldnt it be more like a lean condition in #2? Perhaps that cylinder has better than average airflow (intake runner is straighter??) Can that me compensated for in the tune (If that even has anything to do with it)?

I might be talking out my ****...just an observation.