What would make a 2012 Chevy traverse have a lose it power changed 02 sensors/ mass air/fuel pump/crank sensors/cam timing sensors.No Change At all

I agree with the above answer but at the same time and you shouldn't you shouldn't just be buying parts and guessing what you need that just isn't smart also you should start with the physical you need to do an old-fashioned test on that engine you should start with having a compression test done and a few other rudimentary test that mechanics have been doing for years that might point you in the right direction then you should be looking at the ECM codes that will house will help but what will get you help with the ECM codes will tell you what's going on too but by all means unless you own an auto parts store stop you have no reason to justify buying

Are you doing this yourself? For the money you've spent on parts (none of which apparently made any difference), you could probably have had the engine diagnosed and properly repaired by a qualified shop that guarantees their work. Maybe for a lot less!