6.0 Powerstroke help

I've got an 06 6.0 with 64,000 on the clock. It's building 30+ on the boost gauge then starts blowing the boost off back down to about 20. The turbo has been sticky for the last couple months and I pulled it and got everything cleaned up and free. Hasn't helped any. It's way down on power and blowing black smoke like a freight train. Local dealer said end of next week before they could even look at it but I've got to get this truck going so I can get back to work. It has good power off idle but acts like it hits a wall about 2500 rpm. Any ideas? Jon????

If your sure the turbo is not hanging up again the ebp sensor can get biased and or the tube connecting it to the ex manifold can get plugged up and cause this concern.

Well the tube is clear still could be the sensor they said they could hook it up tomorrow afternoon. The nut on the bottom of the tube split and stripped the fitting Their supposed to have a new one in the morning. Thanks for the help

Another quick question does the solinoid on the turbo connect to the shaft in any way or is it strictly operated off pressure?

oil press. Ive had little success cleaning um, if its hangin it gets a new center section.