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Unlimited boost

In all my years of working on cars I must admit I never thought I'd hear
my self say "it goes too fast".......   But the boost gauge on my 87
5KCSTQ always used to go up to 1.2.  Now all of a sudden it goes right up
to where the fuel pump cut off kicks in and kills it.  I saw 1.8 but only
for a second.  It pulls like the proverbial freight train.  I've been
driving it around using the throttle judiciously.  I checked all of the
vacuum/pressure hoses and could find no leaks.  I am unclear as to how
the wastegate frequency valve is supposed to work but it does read the
kind of signal I would expect to get across a frequency valve.  Is it
supposed to click/ whirr like a an idle air compensator ie. all the time?
 Could a faulty wastegate frequency valve cause this symptom?  Or should
I just take the wastegate apart?  The only wastegate I ever saw hang up
stuck open and I'm having a hard time convincing myself that it would
stick closed.  Anybody got any good suggestions before I go have at it
with the Snap-Ons? 

Thanks   Steve Foster

P.S.  After  I get this fixed I was planning on vacuuming out the dog
hair and putting it up for sale.   Gotta make room for the new/old 928. 
The  '87  5KCSTQ will go down the road for $3,500 if anybody is

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