Something to check when you're getting those emission codes
 

I was pulling my hair out trying to fix the sensors when I looked to the side of intake manifold and seen some shiny wires but they were old and touching each other. Found out it's a knock sensor so I pulled upper and lower. Remember that you need both gaskets for this. .after the manifold was off I was able to reach the nut. Put new one on. .everything only cost 50 bucks. Started it up and she tries to adjust and will unless you have a computer to clear it for a little while but seemed to fix the problem so remember this and hope it helps you