certainly sounds like AFM, did you replace it with a new one?
Boost cut is pretty aggressive, like hitting a brick wall, is that a good description of what your experiencing?
It may also be a knock sensor problem, if its happening under gentle accel.
Get codes checked bare minimum, and take it easy till you have an answer,
faulty AFM will be leaning out the engine significantly, damage may result.
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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i
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