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First disengage your opener from the door by pulling the cord from the track. Move your door up and down. Is it still jerky? If it can't go up smoothly the opener won't do any good. More than likely if it is jerking that implies uneven tension being exerted on both sides of the overhead. One side is pulling harder and "wedging" the door until the other side equals this out (temporarily) and on and on it goes. The sides need to have even pressure exerted. Once the door is properly adjusted then the opener ca be hooked back up. Usually openers only mask the problem before it sometimes becomes too late.
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