2007 5.3 silverado 1/2- 2wd , 60k miles, a/f clean , maf(4.5 gps idle),map (9" idle). Throttle not "coked". No drive ability issues.Trims balance to over/under 0% during light/heavy throttle driving, go -19 lt and -4 st when off throttle or idling . Don't have scanner will read Ethanol %. Question is are tech 2s safe again? Or....