My 2009 cobalt SS is throwing 6 codes, all sensor related, cam shaft sensor, maf sensor etc.

Based upon my research and people I have talked to, it is most likely a ground.

I was hoping someone may have a good idea as to which ground I should check first, considering there are alot of grounds on this car.

The fuse box and computer was out recently and it was not throwing these codes prior.

 

I would start with the grounds near the fuse box. Also verify the fuse box is back together completely and no pins were bent while removed.