I have switchable high / low boost on my car. Works fine on low boost (8psi), but when switched to high boost it boosts to only 14psi (stage 3) and coughs and splutters. Changed to a bleed valve and boosted up no problem, so thought it must be the amal valve. Got a new one and has made no difference.

Any suggestions????? HELP PLEASE!



Cheers,
Pete.