c15 mxs intermittant low boost

I put a new turbo on and it seemed much better for a while and but has seemed to slowly loose boost again and i'm back down to around 35 but once in a while might peek at around 40. I think possibly i have a bad injector??? It feels like there is a miss once the engine starts to lug down around 1300 to 1400 and under. I did put a new autometer pyro on to make sure it's not getting to hot and i have never really seen much over 900 until it get down under 1300 rpm if i keep it up around 1500 i don't see much over 850. I also put a autometer fuel pressure gauge and it always stays around 90 to 95 psi. We have been swamped and i have not had time to park the truck during the week but next week i'll probably be bringing it to CAT or a friend of mine has a brand new snap-on scanner that does everything the cat et scanner does.

Also here are some pictures of the exhaust wheel it looks ok. There not all taken and the same angle it was kind of hard to spin the wheel and keep the inspection camera steady.

http://s771.photobucket.com/user/bstromback2002/slideshow/turbo impeller

 

Also my factory pyro was reading about 150 to 200 degrees lower than the actual temp. Does anyone know what the max I should ever let it get too. The autometer gauge I installed has a programmable warning light.

 

Anyone ever heard of the Iva's causing a light misFire and low boost pressure??? I was talking to a guy today that said he had a similar problem once. I replaced the 3-4 solenoids but I don't know about the other ones they looked like the newer version when I was replacing the harnesses but that don't mean there not bad.