i have a w plate a3 1.8 turbo quattro,at high revs the car will missfire but not all the time,seems to be ok if i build the speed up but if i floor it as it gets over 4000rpm it starts to miss,just took it up the road and got it to miss at 5000rpm and it just kept on missing and would not clear,i have replaced the plugs,checked all pipe work.replaced dv vale and n75 valve,cleaned air filter,cleaned out throttle flap,checked coilpacks wiring,had a look at the maf but that looks dry and clean,now the only things i am left with is faulty coils packs breaking down under load or faulty maf,it does seem to me as it is more eletric than fuel surpley problem,anyone had the same fault,the coilpacks are made by hitachi,