ok this is most likely a very simple fix
firstly, with the boost controller having no spring it essentialyl is working as stock. the spring is what makesthe boost what it is!
now for the rough runnign and no boost.. options as to what it is:
- intercooler hose loose / clamp on too loose
- intercooler hose with a crack in it
- AFM giving problems
what to do?
first, try cleaning the inside of the AFM with a few sprays of brake cleaner
next, take a torch and look over the car at the intercooler clamps to make sure all the hoses are on right. check in the front bar too and thay are hard to see.. most likely that this is the problem...
best of luck,
Warren