My educated guess would say have someone step on the gas pedal (to the floor). If the TB is fully open, then the slack doesn't matter. If you can open the TB more, then something needs to be adjusted.
I can't tell from the tech CD, but you may be able to adjust the cable under the dash where the cable attaches to the accel. pedal arm. It looks like a nut that can be adjusted. I can't tell from the picture, though maybe someone else has done it.
EDIT: I looked at my car and there appears to be no adjustment...
