I had a similar problem, I think your next best thing to do is replace your ignition coils if you haven't already recently. I just bought a set of p2m's ignition coils for $140... very worth.
Also this is a long shot, but maybe check your brake calipers to see if they're sticking to the rotor, because that would make it feel like theres a boost leak or a misfire if its sticking bad. happened to me..
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