[s-cars] Boost problems

[Cory Pio]

Im having some issues with my car the main one being boost. If you pin  
the throttle it will boost, but if you accel than let off the throttle  
and try to build boost again it wont come out of vaccum. The turbo  
also flutters when holding boost. I have already replaced the n75 but  
im thinking its probably the wastegate diaphram or possibly the  
diverter valve. The diverter valve was replaced with a forge one not  
sure what milage. I just purchased this car with around 120k now it  
has 125k. When i first got it would build boost effortlessly and hold  
15psi in all gear with not too much throttle. Sometimes it holds  
around 4psi for some reason. I cant figure this out. Downshifting to  
about 4k from any gear and opening throttle doesnt build boost either.  
The only way i get good boost is going wot throttle from 2k or going  
up hills. Could it be something wierd like a clutch/ engine load  
issue? It used to pull 20 in hg but only  pulls around 15 inhg in  
idle. Thanks in advance for any help. Ohh and one last thing im  
redoing my front steering/ full suspension does anyone know if 1993  
came with a steering damper? My steering is very loose thinking tie  
rods and i just did the engine tranny mounts myself and wondering if  
anyone has a source on good subframe bushing for front and rear? Like  
some hard derlin ones... Im Having trouble contacting amd. Thanks again