i'm having similar prob at the min, have changed everything in the ignition system, plugs, leads, coilpack, had been running sweet, but last week or so its developed a miss low down in the rev range, but once the revs are up, its fine.... but just as you press the go pedal, it misses.....

i should also add its all standard, apart from an exhaust system and a forged bottom end, though i haven't up'd the boost, staying standard boost level....