My glanza done the same and I changed plugs, plug leads, rotor arm and distributor and made no differences so then I changed fuel filter and run injector cleaner thru it and seems to be ok now
I am td04 and forged and should b running round the 300bhp mark and I raced VXR astra and beat it no bother and there was ment to be bit of work done to the astra
Will I have a coil ordered and should be here in the morning if that don't fix it all that's left is to change my leads but can't see it being them because were on put on about 6 months ago
It missing on full boost but if I lift the foot off and put it back down it goes ok and if I put the foot down slower it don't miss ether
So far I have changed
spark plugs
rotor arm
distributor cap
And my plug leads wouldn't be 6 months old
Anyone know what would be wrong?