I had to research each individual code and they all point to your...
Intake Temp Circ High Temp
MAF sensor performance
Random Cylinder misfire
Secondary Air Malfunction
Engine oil pressure sensor low voltage
I'm suspecting an issue with the voltage somewhere between the sensors and the PCM or the PCM and the battery. Clean all battery connections, reset the codes and see what comes back.
Ok so I haven't been able to recheck codes, but with clean connections I reset the battery but haven't noticed anything different. The Olds is still indicating Low oil pressure and the transmission is shifting long, with noticeable low power especially up hill. Also have reason to think the air pump is failing.