its like 30 degrees out and when i give full throttle the car goes rite up to 1.5 bar .. even more... and just starts sputtering then tapers down to 1.3bar as the rpms go up. but if i go from like a 1st roll it doesnt really do it when im going through the gears... only like 2nd 3rd 4th and 5th roll it does it badly
car is tuned by The shop. what do you guys think? retune?

 

Set peak boost in 5th. If it creeps then turn it down. This may only net you 16 PSI in 2nd and third, but hey, that's life.