Lannyl81

Ok..got under the Z...the cats and exhaust system are both OEM.

The only "thing" I did find were the hose on both Stillen intakes, up near the throttle body, that go to the valve covers (PVC system)

Anyways both rubber hoses were folded-over due to the tight turns the hoses make between the slide-on connections.

Could this be the issue?

The more I look into these two error codes, the less I understand....like...why is it only the two post cat O2 sensors reporting a lean condition? If the fuel mixture was lean I would think the pre-cat O2 sensor would report lean as well....so my thinking is that there is no un-metered air entering into the cylinders so I can stop looking for a vacuum leak.