fresh rebuild... idling at 1250 before stalling out... -50 boost
 

so, gigure there has to be a vacuum leak.
2 possible culprits... the EGR line from the front of the front intake elbow is not connected (but shouldn't affect vaccum right?!)
OR; i have one small nozzle not conencted by the look of it... first nipple on the elbow coming up from the rear turbo... sitting WIIIIIDE open... missed it, no idea where it goes even from the diagrams!