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You have a cat code, do you have cats on the car? I would bang on them. If you hear any rattling, its the honeycomb that broke apart and is now clogging your exhaust system. This will certainly cause running issues especially the way you are describing. Hell, you could just pull the front o2's, starting with the driver side, and see if it runs better. This will tell you if you have a clogged cat.
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