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hmm, OK. Is that something that needs to be fixed, or the turbo cleaned? Maybe I wait until it gets worse? I baby this truck around so I rarely pound the pedal. Never noticed it when I was pulling a heavy trailer, even up a hill - guess I don't try to accelerate real fast doing that, just long and steady.
Apologize for not being a tech - when I inspect, what am I looking for?
If you don't work on the truck then you might have a trusted shop in your area clean the turbo if this has never to your knowledge been done. Most likely the unison ring is rusted or you have an early 06 late 05 turbo that may not have the relief cut. When the turbo sticks, the boost is slow to respond allowing a whiff of black smoke. Neglect, it could turn into an over-boost or under boost. Under boost is not desirable when merging into traffic, over boost can do funny things and cost money.