i replaced the motor on my ebike -- it had bad halls -- with an identical motor, along w/ a new controller. has the same battery. but now the thing goes like a bat out of hell, no matter i choose slow mode or fast. the moment i give the throttle a nudge, the motor jerks a few times then smooths out as a higher speed is reached. i just want it to amble along like it used to do but that's impossible now. and i have no idea what i did to make it act like this. thoughts, anyone?