2005 Hummer H2 SUT 6.0L has engine surge between 1500 - 2000 rpms when hot

What is your question?

ive changed spark plugs, wires, coils packs, cleaned mass air flow and TB, fixed intake manifold leak, replaced serpentine belt, replaced water pump, new battery, crank shaft position sensor, yet the entire time my engine surge never went away and its also losing power and driving sluggish. i have no clue what to do next. no codes, and all systems are running good. great idle, when cool it runs like a new truck. its just when its fully warmed up it drives like im pulling the titanic on pavement.

What makes this problem better or worse?

worse when warm

How long has your 2005 Hummer H2 had this problem?

from 100,000 miles. im currently at 130k