massive cogging issue please help
 

Lrp 5.5t motor, lrp ssx stock version speedo, 77t spur gear, 17t pinion, 4500kph 45c Lipo all inside an lrp blast s10 tx 1/10 truck 4wd. New sensor wire, new spur gear and new pinion. All I seem to get is huge cogging on start and won't go anywhere just seems to jerk and stop constantly. Has anyone got any ideas?

Are wires correct A to A B to B?
is esc at recomended settings?

Could be broken sensor board in either the esc or motor
Try a different one or the other and see if it goes away