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It ended up being a simple exhaust leak, the header-xpipe bolts had wiggled themselves completely off. If you've had any exhaust work done recently, I would check that. From what I understand, it's very strange that all cylinders in bank 2 misfired at the same time, so it points to something that would affect the entire bank (like a huge exhaust leak fucking up the O2 sensor data for just bank 2, which is what happened with my leak)
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