2009 GMC Yukon Denali 6.2L Flex-Fuel Part 2; Cleaning the Mass Air Flow Sensor

Well...here we are, having a part 2 on the Yukon. Clearly that means replacing the knock sensors didn't fix the issue. The up-side is some of the previous codes cleared but not all of them.
I'm still getting evap issues so that brings us to this episode where cleaning the MAF sensor along with some general maintenance is on tap. I changed the oil, spark plugs and wires along with a new air filter. I also inspected all the air intake system for any cracks or leaks to no avail.
The gas cap appears to be in good working order so that shouldn't be an issue either. After all this work we are still getting more codes so that means...stay tuned for episode 3 of the 2009 GMC Yukon saga...yes, I said saga...