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in the interest of future members with similar issues (nothing worse then finding a relevant thread about an issue with no resolution noted) i found the problem shortly after this post!
Had another look after reassuring myself I wasn't going nuts and it sounded like a vacuum issue and I found the fitting under the top mount had become brittle and decided to snap in half, missed it the first few looks as the damage was covered by the heat protection shroud, quick line change and we are back to full boost! Next job will be replacing all the vacuum lines under the top mount, these poor lines are subjected to some harsh conditions and simply just become brittle so easier to fix it before it becomes an issue!
The Following 7 Users Say Thank You to JoelyMoley For This Useful Post:
4bye4 (21st December 2018), Bidja (21st December 2018), Fireblade (21st December 2018), foggs (4th March 2019), mudski (21st December 2018), PeeBee (21st December 2018), Touses (5th March 2019)