Wastegate problems. . . Any thoughts

[Stpndsmnn at aol.com]

Here is the problem;  my wastegate is allowing 6psi of guage pressure and 
then it opens and dumps.  This only happens at full throttle when I reach the 
6psi so around 4K rpm I can watch the guage instantly drop from 6psi into 
vacuum.  Right now the WG is connected only to the exhaust manifold, I 
unhooked the connection from the side of the WG which was connected to the IM 
but that made no difference.  Is this a diaphragm issue or????    The car 
will pull really well up to the rev limit as long as I keep it below the 6psi 
dump threshold but it sure would be nice to have 6psi at least up to the rev 
limit.

Thanks
Matt Kramer
'83 CGT turbo