different type of HV problem..

anyone ever have a STUTTERING(not glitching) problem with their HV..??..........has run(in competition) fine until today. then applying quick throttle, the motor stutters and barely revs. but, when i slowly roll onto the throttle, it revs up completely. every connection has been triple checked. nothing loose and no frayed wires. not a gearing/thermal issue. batteries fresh and peaked. the symptoms are the same even with the pinion pulled. bottom line is that all of a sudden, the system seems to not like heavy, qiuckly applied throttle. not a binding, glitching of thermal issue........