jitter, hesitation, lag 'tween 2-3k rpm

[Bumber]

On accelerating, under load (usually up hill), I notice a faint lag in pull/torque that repeats until I increase rpms a thousand.
Does the same whether soft or hard pressing on the gas.
(Manual Trans).
Passengers do not notice it, nor do the rpms drop any.

Anybody got experience or clues?

[Final-Reality]

Torque peaks at about 2500rpms to ALMOST 155ft-lbs, then dips down, then rises again to a peak of 155ft-lbs at 4400rpms, so in between there, there's a lull for some reason... it's obnoxious but I donno what to tell ya

[Bumber]

sorry for my lack of communication - it hesitates about 3x in 4 seconds and continues as long as it takes to pass 3K

[BLK03GXS]

Sounds like its just what final described, a hole in the power band... downshift :P B)

[jeremythebear]

Does this happen when engine/tranny are cold? If not, tranny intercooler?