Things that come to mind:
Does it still have EGR in operation?
If so, the EGR valve could be stuck open and loosing boost backwards through it.
Have you checked your boost hoses real good for any leaks, tears, etc...where you could be loosing boost.
On the MAP sensor, pull it back off and run a piece of heavy wire down in the sensor's hole on top of the intake and make sure the inside of the intake has not bridged over with goo to where the new MAP senor cannot get a proper reading.
Check the air suction boot/pipe between the air box and the turbo inlet and make sure it has not collapsed or come apart and is stopping up air flow going into the turbo inlet.
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It Works!
Bought everything to build test plugs for the intercooler hoses on Tuesday so I thought. I forgot one fitting and tor up the shop looking for it or someway to rig something. So yesterday was another trip to Homedepot for a 1.69 pipe nipple, I bought two. The hose from the intercooler outlet hose has a split in it under the covering.
