5kt boost trouble

[Jay <j-yr-be@snet.net>]

my 86 5kt motor has power untill about 3500 rpm.  Then the boost stays
at 5psi but the car dogs.  I did see it go to 10 psi and it pulled to
redline but only once.  It's only been running for 2 days.  I checked
for vacuum leaks with wd-40.  I think its either the temp sensor in the
intercooler or the fuel dist. or possibly the knock sensor.  It doesn't
usually like to rev up, it does it kind of slow.  Any help would be
greatly appreciated.    Jay