het guys I have a 97 gtp im have boost problems I was showing about 8 psi then I done some more mods an now its only showing 2.5 psi its showing it around 3500 to 5000 rpm after that it drops even more to around 1.8 an I cant figure out what is going on any help you guys could give I would really appreciate ill give u a list of my mods at the bottom

p&p s/c
p&p lim
3.3 s/c pulley
cai
high flow fuel filter
3" catless down pipe
new crankshaft .010
new 3800 Powdered Metal Connecting Rods
new crank an rod Bearings .010 under
new cam Bearings
new piston rings
140# valve springs
xp hot cam
double roller timing chain
new oil pump
resurfaced heads an block
zzp 1.0 PCM
new tranny
new Tensioner
ac delete
o2 sim
alt booster
front power log
egr delete
autolite 103s gapped at .50
new maf,iac,tps
got a new sc belt on the way
new plug wires
I believe that's everything once again thank you guys for your help