Right, I have a boost problem with me Esc Cos. When I put me foot down it hits around 12psi and holds that till around 6k on the rev range when it suddenly picks up to its usual 35odd psi.

I took the car to SCC who put a bleed valve on and it run fine set to 30psi. So I changed my Amal valve thinking this was the problem, but the problem still persists. We have extended the wires on the amal valve due to tidying up the engine bay, so will check our wiring tomorrow.

Anyother things that could cause this problem?

Cheers for any help!