My s2 rs is currently to this spec,
1600 cvh bored out to nearly 1700
accrilite pistons,
heavy duty bearings
arp bolts throughout
group a headgasket,
piper cam
vernier pully
stage 2 hybrid t3
gotech management.
Right now to my problem the car will run a drive fine but now and again it will either go down on three or cut out compleatly but turn the key and it will start and drive fine again! then yesterday it done it a couple of times then it got a missfire after about 3500 revs! but runs quite well under 3500 only over do i start getting the problems.

Leads , cap , dis , spark plugs are all new it had a new grp a cos coil,
any surgestion will be greatly recived as its doing my head in!