It started happening when i turn the manual boost controller by accident and tried turning it back to where i thought it was but know when i go full throttle it will like cut out or stop when boost would reach around 10psi so when i turned it back a few to about 7psi it will run fine it won't cut out at all, why does it do this? The guy i bought it from said he had it tune at 15psi but turn it down to 10psi for daily driving.

 

WHAT KIND OF TUNNING MANAGMENT DID HE USE.