I have a 6 AL digital and a digital 2 step with the dials. I'm having an issue with the 2 step. It is set on 3500 rpm and when the transbrake is set and the throttle is depressed it will stutter lightly and then go through the 2 step all the way to the flash on the converter. We have changed the 2 step and the box and still have the issue. Any ideas?