Low power/lost bottom end

[DaveG28]

Had a bit of a weird one, had a bad landing off the jump at Worksop on Sunday in my 2wd final, and from that point had no bottom end power at all, and slightly off on top end too. When checking afterwards it dometimes wouldn't move at all from a standing start, though sometimes does and would rev in my hands. Have checked and can't see any loose wires/sensor lead, although the motor wires were hot at the end of tha run..

Anyone know whats likely causing the problem? Sensor lead/esc or motor??