running like shit
If your car is straight piped and untuned, then the o2 code will pop because you don't have rear o2 sensors.
If EGR is deleted and car is untuned, EGR codes will pop. On a untuned but full exhaust car both these codes will pop. So to me code-wise they have nothing to do with your current situation.
You need to describe what "running like ****" is. We cant go off of that. Low idle? hesitation? backfire? we need details of whats going on and what you've done so far. This could be simple such as fuel filter or dirty MAF or complicated like fuel pump or ignition coils.
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