What would cause these codes to pop up all at once? on 2000 Pontiac Firebird

The codes are P0151, P0131, P0137, and P0300. I find it unlikely that 3 o2 sensors would go out all at once. I am looking in to replacing all the plugs and wires to see if that fixes the problems. Is there anything else that would be recommended?

Asked by for the 2000 Pontiac Firebird
2 answers 1 comment
don't waste your money seek diag to get it right the first time. you may have a circuit issue
I took the firebird in to a mechanic that i used to work for to see if he could narrow a few things down. He is thinking it is either the mass airflow sensor went out or it is just not getting fuel.
Other possibility is a fouled catalytic converter. This will back-up the exhaust flow, tripping o2 sensors. Need diagnostic on flow to determine issue.