chris-RB5

basically i'm over boosting and the problem seems to be getting worse every day. should be boosting 1.2 bar as it's an rb5 ppp, yesterday it started boosting to 1.4 bar just put it down to the cold weather, but 2 nite it's been boosting to 1.4 and still with my foot down dropping to 1.0 bar then back upto 1.7 bar and then fuel cut is kicking in. Pleas help it's really pissing me off now.

Ps isn't the boost solenoid has i had 2 spare in the garage and tried them both 2 nite