actually, I meant that i heard that good throttle response is difficult to achieve on the nnbs trucks... That since they have the new etcs that are completely ECM-controlled as opposed to the pedal-follower type etcs of the older trucks, they are lot more complicated to get right... That's why I asked what truck you drive. Maybe its really not all that difficult at all and my tuner just didnt really know what he was doing, LOL .