i just got back from a dyno tune on monday, a couple days ago i got a huge misfire when i would accelerate hard. when i hit 12-13 lbs of boost (3800 rpm)it would just fall on its face. i could slowly accelerate past 3800 rpm and it wouldnt stutter, but once i went WOT, it would spike to 12.6 ish and misfire.
i changed plugs, i monitored coolant temp and thermostat is working properly.
primary o2 sensor reads .889 volts at WOT. (A/F ration should be good since i was just dynoed.
all mods are in my sig.
if you have any ideas i would love to hear about them!
thanks

 

Is it a P0304 cel?