Motor won't run continuously
>Any more ideas?
Try to reverse the throttle channel at the transmitter. As a safety feature, ESCs won't let the motor go to full throttle whne the TX/RX is first turned on (as ghostbear says in #3), and if the throttle is reversed, it can't go through the startup sequence.
Is the the same stuttering brushless motor thst you might have toasted last November?