1st thing- I would try is Techron Concentrate Plus.
It may be severe carbon buildup on the lips of the valves. (sticky valves) causing the misfires.
Carbon buildup can occur in as short as 5000 miles.
2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L - 83,000
2010 Traverse 3.6L- 148,000
2003 Trailblazer 4.2L- 181,500