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blower motor lurches back and forth, clockwise and counter clockwise. ocassionally the motor will run correctly for a few seconds and then starts lurching again.
 

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Post brand and model of furnace/air handler. So we have an idea if you have a PSC or ECM blower.
 

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X13 blower motor. Its a constant torque motor. Check for loose low voltage connections, and that all line voltage connections are tight. If they are all tight, motor is gone.
 
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