so my 07 Suburban 5.3 230k with original cats, injectors and coil packs has recently begun a slight rough idle before reaching op temp. At op temp its still stumbles ever so slightly but not constantly. During warm up is the rough idle that was barely noticeable until recently... slowly getting more noticeable. I do have my O2 sensors throwing a code on both sides but before going after those with new ones, what is the best way to test my sensors to make sure they are truly at fault?? I have a code reader device that also does live data, problem is I do not understand the data or what to look for. Any direction to a great tutorial video would be greatly appreciated.

Also, acceleration is perfect and smooth no matter hot or cold

thanks!