| First of all, removing *an O2 can be a pain. Both? Grr. The PS O2 is the EASY one.
DS? NO WAY. When removing these O2's there is a big nut that screws into the DP, then the O2 screws into it.
Inevitably these 2 pieces gald and sometimes are inseparable.
They come out in 1 piece, and it's easiest to simply buy a new nut too. So OEM O2 ~$90, OEM O2 nut ~$12, so $100. If you're lucky maybe someone has a good one in your area you can swap in to test? As you say, you've cleaned/checked the IACV, AAC, AR, and have checked for vac leaks. The problem might or might not be the O2.
If you're tight on cash you might want to continue checking things.
There's even an "O2 test" procedure here somewhere. Can a sluggish/bad O2 cause rough idle? Sure can.
Am I willing to bet the $100 you likely don't have on that? No. There are alot of possibilities.
If you narrow down the rest, then it might be your answer.
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