Detroit 14L Turbo issue

Hi, i have 05 columbia with detroit 14l engine. This morning on the way to pick up a load turbo started acting up. There was some kind of hissing noise, turbo would start to spool, and I'm assuming turbo actuator would start doing its thing and power would come and go, now every time this happens huge cloud of smoke would come out of exhaust pipe. Called my comp. to cancel a load and on the way back, about 15m into it everything was fine. I just checked turbo shaft play and there is none in/out, side to side is minimal, there is no oil leaking out of it, its dry. Turbo actuator was replaced about a year ago. Now what i have noticed time to time even when its idling actuator shaft would just go up and down and turbo would make this noise just like this morning, any help is appriceted, TY

 

I came across this 11 page post and people there had the same issue, and freaking VPod was the problem in most cases, i guess i need to start there. TY

Detroit 14L turbo,vpod,actuator issue. or a sensor

 

Update, replaced vPOD, 2nd day and so far its working, Thx for help