NBS Sierra 08 Dyno Problem

[wailalghanim]

I toke my 08 Sieera to one of the FEW Dyno-shops available in my country, tried to run it on the dyno,
they couldn't run it normally, the truck kept engaging some kind of throttle control exactly as the traction control, even after we disengaged the full stability control, the engine wouldn't stop stalling in the 3rd gear at around 4000 RPM, make it impossible to give a correct readings, on the wheel power read only 224HP.

Is there a known problem with the NBS's on the Dyno? is there a special preparation to perform this? our local dyno shop is not very interesting in finding solution to this, so I should take the initiative.

My truck is the SLEII type of the Sieera, comes with the 5.3 engine four speed transmetion, 4WD with the auto 4wd Option ( not AWD )

Please Help.

[road rash]

Is the dyno setup for a 4WD or are you dynoing in 2wd ? It might have something to do with it.