I am very new to stepper motors and machine building. So I completely expect that I am the source of the problem. However, I am running an Arduino Uno and some stepper motor drivers (Motor shield v2.3) from Ada fruit. The Adafruit steppers work fine where as the open build steppers jerk around and mumble with tremors when the program is idle. I have played around with the wire pairs to no avail, always keeping coil pairs together. I am running them with a 12 V 3amp Meanwell power supply. I only have two stepper motors running. Both steppers are Nema-17, why would they behave differently?