Finally just got around to installing some new parts.new acdelco 4 wire heated o2.new knock sensor.new aem wideband o2 wired to read in tunerpro.I can say this.in 10 logs I've gotten a lot closer to feeling right than I ever got with out the o2.it's also left me thinking the tic I hear might be exhaust leak.great tool for tuning and finding other issues.feeling the difference between 14-15 afr at above 60-70kpa to 12.5-13.5afr at same kpa makes u really see what to do to get the response u think your adjustments make.once I get some more time I may try open loop afr tuning to see how far off that is.really wish I'd put thw wbo2 in sooner.