6.6 duramax on 2500-3000 RPM runs really sluggish

Car: Chevrolet, Silverado, 2007, 6.6L - Back to Fix-It

Q.I have a 2007 silverado 2500 classic, 6.6 duramax.
The problem I am having is when you take off from dead stop get it goin about 2500-3000 RPM
it runs sluggish, then all of the sudden it takes off, blowing a large cloud of black smoke.
Its acting like a 2 stroke dirt bike when the power band kicks in.
Fuel filter is new, Air filter is new, Fresh oil change.

NEED HELP!

Thanks Josh.

More Info required does the check engine light come on when this happens?

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6.6 duramax on 2500-3000 RPM runs really sluggish