So far All vaccum lines have been checked, rechecked, and checked again.. We have confirmed correct operation of the entire turbo control system. Replaced all bad VSVs, corrected the boost controler mounting, removed the boost controller.

Next step, TT conversion, even though the we know the diaphrams are good, and the VSVs are good, just to rule out the last possible thing before saying a turbo is bad. Turbos have never been off and the car has 116k.