1N4007 or MBR340 for Flyback ?

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i have mega 2560 ramps 1.4 , 4 steppers ( similar setup to, not 3d printer ) , 4x20 lcd screen connected ramps board.

the psu ( 12v 18a ) directly drives 12v dc motor remote control offroad truck ( 5000 rpm low speed, high torque, brushed motor ).

am getting scrambled screen on lcd, , suspect caused motor, wondering if 12v motor should have flyback diode ? motor in setup thing different 3d printer uses other same parts.

i have 1n4007 diode, , larger mbr340. either of these suitable ?


try 1n4007.
btw, have fuse in circuit large currents flowing.


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