wideband AFR's on the leaner side ~15.0, but i also richened it up in that MAF range to ~14.2 to see if it changed anything but to no avail. plug gap is possible but also may be the AL103. whats the standard life span of these, 10k miles? the 6-7k was a guesstimate. wouldnt hurt to get new ones and gap them smaller than 0.050? 0.045-ish?