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The driving experience between my old civic and my e92 are light years apart even though the civic was great. So I think you made the right choice.
You most likely have some kind of small vacuum leak which is why you're getting that code too. What scanner do you have? If you got an obd2 Bluetooth one you might be able to use "bmw deep obd" app to get bmw specific codes to help pin point this better. Or use a laptop and get bmw tools from bimmergeeks for free and scan with inpa with the bimmergeeks kdcan cable.
Do a look around for leaks though I think if you said it got a bit better with Techron you could swap the bank 2 injectors to bank 1 and see what happens. Injectors rarely fail on these engines but yours is also high mileage. Other thing that comes to mind is an intake gasket leak which again at that mileage could need attention or a pcv hose cracked. Get yourself a little smoke machine for parties to put smoke in the intake with the engine off.
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