2006 Cummins ISX 400, low power, lots of black smoke from stack

EB into Rawlins, WY truck lost power and lots of black smoke from stack when on the accelerator. Got it into T/A and tech checked Air to Air and CAC and all piping. found no problems or leaks. Didn't have equip to test turbo boost though. Did say that rear two cylinders were running cooler than others. Suspects valve or injector. Any suggestions to help? If i tried to limp it to Salt Lake City where I live (300ish miles), would it cause more of a problem? Any advise on a good shop here in town? Its Sat evening, Wyoming Diesel Service cant get it in until late Monday or possibly Tuesday. Elk Mountain can get it in Monday morning. Any other shops or mechanics worth calling here?

 

T/A tech did check actuator, but not by taking it off. He had me rev the engine while he watched it/ felt it as well I think. I couldn't see what he was doing exactly.

 

No check engine lights at all. Seems to idle and run smoothly, just no power and a lot of smoke. can hear turbo whine when at higher RPM like above 1300.

 

Yes, I realize that. But not sure what is causing it not to be burned.

 

Do you think it would be detrimental to try to run the 300 miles to SLC?