Hey guys, Have just converted car from manual to manualised auto.. It drives fine and idles fine. But as soon as you start to put foot down it just builds boost and missfires very bad. First test drive it seemed ok and then this started. Car was running very nice the week before.. Was sitting on hoist for around 4 days with battery disconnected. I have checked the intank pump and put a new 044 in it. Has a fairly new cas, also run a crank trigger which has been fine (vipec ecu). I'm thinking next thing to check would be fuel pressure and fuel filter? Any ideas would be great as it seems very weird.. Ian ---------- Post added 03-11-11 at 16:38 ---------- Changed CAS unplugged everything and plugged back in. Has 30psi fuel pressure at idle. Drove down the road, wasnt doing it as much but then it got worse and is back to how it was. Ideas?

Check ur dizzy timing I've got a hicomp and runs fine til you put ur foot flat to the floor then it coffs around 2800rpm if u baby it through the rev range it's fine it happend to be timing retarded timing wierd but I advanced it a little and now it runs sweet

did you change the TPS (Thottle position sensor) to an auto one?

Was the cap or leads. Changed them both. Cap had a tiny little crack in it. Leads weren't that old..