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I think I got it figured out. The throttle pin for the fuel shut off was broken. Inexperience I guess. I didn’t realize it had a longer shaft until I took the one out of another pump I have. I could get it to stay for a little while, then it would come loose and there was no way to stop it.

I disconnected the intake from the turbo. Had to bleed the injectors again as it had lost its prime I guess. Turbo disconnected and no way for an alternative fuel source. The truck still fires up with the same symptoms. Pours black smoke and goes screaming wide open. The only way to regulate...

I pulled the curve part off the intake on the downstream side of the turbo. It does look there is some black motor oil in there and in the turbo. The turbo doesn't seem to have any slack in it. How would be the best way to repair the issue? May be just replace the turbo, or can seals be replaced?

Were you able to get this resolved? I am having a similar "runaway issue" under the same circumstances i.e. fuel control arm is moving free, flame heater is deleted, new fuel pump/filters, etc.. Truck idles good for a bit then starts smoking bad and revs up well out of normal operating range...