Problems on boost
 

My sti v4 type r has started misfireing / spluttering when it gets to about
1 bar boost, this very servere but stops as soon as i ease of boost .
i am running 370 bhp Gems ecu etc. this problem has just started any help or ideas appreciated.

Could be a dodgy boost solenoid . Sounds similar to my problem although haven't had a chance to look at it yet.

Thanks
James

Thanks James you were right after i must of tried everything else possible including the evc when it was just the solenoid.
thanks for your help mate.
Regards
Nigel