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Hey everyone, so I just recently bought a 2012 sti to replace my old 07 wrx and it has a weird issue that I haven’t been able to figure out. So when I’m driving, the engine almost feels like the clutch is slipping and what I mean by that is the turbo is still spoiling and I have no roughness in the cylinders but it feels like a misfire. I’ve down a leak down test and everything was within spec and I also changed spark plugs and cleaned injectors but nothing is solving the issue. If I’m FT the car starts doing it around 4K but if I’m lightly touching the gas, it does it immediately. I did get a code p0420 for my cat being insufficient so I’m wondering if it’s that sending a bad reading to the bank 2 O2 sensor or something else. Thanks!

Brad
 

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It doesn't use the rear o2 at full throttle.

That sounds like misfire. Is the vehicle modified?
 
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