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Saw another post recently about testing to determine whether the AOS is bad or going bad. With the car running remove the oil filler cap. If it's tough to remove, like there's pressure in the system keeping it on (you'll hear a swoosh or sucking sound when removing it), then it's likely the AOS. If you haven't see any of the infamous AOS tail pipe white smoke clouds, that's probably not the problem. Don't think the AOS causes your symptoms. A bad MAF sounds more likely.
I believe one way you can test the MAF is to try running the car with it unplugged. If it runs better, the MAF is likely shot. Someone else more knowledgeable about this will likely chime in. Lots of MAF posts on this forum. Have you read them all?
If you need to buy an MAF stay away from eBay. I've heard ********************************az has got just about the best price and, unlike eBay, you'll get the correct part.
You didn't mention whether you're still getting codes after the oxygen sensor replacement.
How many miles on your car?
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