[Zippo of Death]

I recently started having a problem with my jimmy dying randomly. I initially thought it was the cat that was clogged so I bought a new one. We cut the old one off and it was hollowed out, so we put the new one on. It's still dying. I will be driving and it will start cutting out and then all of aq sudden it dies then, I have to wait 2-30 mins for it to start again. We took it to autozone had them read the codes it threw 6 codes that werent for the vehicle. So, they reset the computer it threw so many codes the reader ran out of memory... Is my truck really that messed up or is it the ECM?