hi there mick....
I had exactly this with my r too.....
it turned out to be a air leak from the intake manifold...
after sorting this i did all my vac pipes with braided hose and this sorted it out...
the hose was only about a tenner if that with enough to do it all with some spare...
i didnt bother with the silsicone ones because differant people suggested that they was not as good as the braided version...
To this day I hold constant strong boost....hope this helps....
Also to eliminate the valve try cleaning it.....
it will only take an hour at most .... ( heres a a link to how
http://www.vpcuk.org/forums/showthre...valve+cleaning )
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