i'm having this EXACT issue. i thought i had fouled my plugs so i replaced them but still the problem persists. i'm heading to the dyno tomorrow morning to get a re-tune b/c for me i just slapped on a new intercooler and manifold so i could be leaning out in the mid range.
for me i studder and bog between 2.5 and 4k rpm but above that i run fine.
other things that i recently change are no more bov and a breather filter on the iacv pipe instead of running to the coldpipe.
all of this b/c of an accident. i'm praying the motor comes back to life with a good retune b/c then i'm out of ideas.
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