2008 Chevrolet Malibu Cat possible, difficult questions

Okay I have a 08 Chevy Malibu LS with 140,730 miles (yes I do a lot of driving)

So my question for you guys is this I recently had the MAP sensor replaced because I had the map sensor code and a service traction pop up. So after replacing that it didn't seem to fix the issue it actually made things worse. Now it to the point where I come to a stop it is very slow going and sluggish then it will go. So I took it to a shop for a diagnostics on that issue which was a vacuum leak somewhere. They came back to me saying it's the Catalytic Converter being clogged. Well I don't have the money to fix it at this time. So I was checking to see temp fixes. I contacted chevy because they extended the warranty but they couldn't help me due to my mileage go figure. So I took out the top 02 sensor drove it down the street it had the power but I didn't go far because of how loud it was. So I figured it was a clogged cat. Well today I unplugged the bottom 02 sensor and drove down the street and I still had full power drove it further then I did with the top 02 unplugged. So my car has 2 cats one at the front attached to the headers and then one after the second 02 sensor then it goes into the muffler. So I'm not sure what this means. Well I revved the engine in the driveway to 4k RPMS then tried to take off with the 2nd 02 sensor out and it didn't have power.

I also noticed that I had some oil in my air intake tube after the MAF sensor.