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as he said before i tried another pair of working coils and it made zero diff. what kind of threw me off is if you rev it at idle, no load, it will go fine with no misfire, only under load. so by taking out the majority of the boost and having the problem persist would pretty much rule out compression related issues, so it must be something with the fuel system. although i thought in another post you said you had a afc hooked up and by lowering your upper-rpm fuel trims you were able to elminate the miss, but your o2's were very lean. like .76-.8 . i kinda wonder how accurate the stock o2 sensor is though. we just did some logs on mine with a big16 and stock injectors and even down to 11-12psi we were seeing o2's around .78-.80
but still had low knock and decent timing. i think i would try the afc route and go have it tuned on the wideband. i think you have tried just about everything else. :headache:
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