I was boosting 4-5lbs yesterday after finishing up the turbo install. Today I cant get past three lbs, also my car is idleing weird every now and then, up and down 1-2 hundred rpms, my vacum guage was reading 25 yesterday, strong! today 20-21, could a vacum leak cause all of this? also my delta 2 external wastegate is almost all the way in, can I change the spring out? Also, could the fire ring gasket be leaking on the delta gate? Please help!

 

check for any vacum leaks,and check all your IC pipe see if its loose.