Are you sure it isnt a problem with the controller? Did you try to calibrate it in windows?
When you are in map controllers,move the throttle,that will highlite it,select analog throttle 1 from the options,then calibrate the axis. Sometime you need to invert the axis,so check the advanced box with the axis selected and move the controller. You will see the movement in the RAW and Scaled window,they should both go all the way to top and bottom.
If the axis is inverted,the raw window will show the slider move down when you push forward on throttle,if thats the case check the box upper left to invert axis.
However check in windows to see if the throttle will calibrate and is functioning properly first.
hope that helps.
