Accelerator Pedal problems of the 2003 GMC Sierra

Poor throttle response. Drive by wire throttle. Engine has no response until 2000 plus rpms. Our 1999 yukon,and previously owned 1996 Sierra responded immediatly to throttle input,unlike our new GMC. As the corvette has a drive by wire system,this should have been sorted out long ago. As installed,this system makes it a hazard to pass slower vehicles because you have to anticipate when the thing will work. Vehicle going back to dealer for remedy.