Motor Stuttering Problem

[Unexas]

Our pickup motor is stuttering it will not get up to full speed going backwards but will forwards. But stuttering is apparent going both ways. We have tried multiple motor controlers and cim motors but nothing different happens. We have tried multiple PWM cables and slots as well as re-formating the robo-RIO. Our battery is good as well.

The code is a motor running into a case structure that flips between on and off based on if the button is pressed.

We have used an arduino to send the PWM signal to a Talon to and in doing that it works perfectly.

We need help.