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My SR car did something very similar for quite a while, sometimes it would boost and sometimes when I accelerated too hard or too a corner too quickly it would buck hard about 4-5000 RPM. I took it to a good friend's shop, tested out 6 different good MAFs thinking that was my problem and it turned out the tune chip in my ECU was vibrating out and not staying fully connected. This is a long shot for you it seems, but I say just double check and make sure everything inside the ECU cover is solid and secure.
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