2014 Chevy Equinox-Catalytic Converter changed-Codes P0131 & P0171

Chery68

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HELP!!
I had my Catalytic Converter and Oxygen Censors changed a little over a week ago.
3 days after it was changed, my engine light came back on again reading codes P0131 & P0171.
I know what these codes mean but I'm wondering if anyone has any ideas what it might be with just
having the new one put on. It is running rough, especially if I gun it, which I am not doing because I know
that I shouldn't even be driving it. Please advise if you have any clues what I could do first
(besides taking it to my mechanic, which I am doing this week)!
 
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rwagoner

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Kind of sounds like a vacuum leak, which may have killed the cat to begin with. I did find this thread that may be helpful ...

 

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