I have an 03 GSi and it has recently had a new turbo fitted under warrenty, they fitted a turbo off of a SRi Turbo mk5 and the car never boosted correctly (2500rpm) they adjusted the actuator (after protesting it was setup correctly!) the car then boosted right, but they said I needed a new AFM aswell, so I bought one and all was well.
Now the car seems to be really hesitant, and sometime the full power doesn't seem "kick in" until around 4000rpm like it was before the actuator was adjusted!
Could this be anything to do with a coilpack? or maybe boost control solonoids? I'm hoping it will be a cheap fix, but there is no-one around here who I know with a GSi so I could borrow a known working coil pack :/