Welcome to the forum SteadyPin!
Charles makes some good points to check out.
One thing you may want to check first though if the movement is out of the case is that the tiny lever that sits in a small slot on the rim of the watch not far from where the stem enters the movement, is pulled out. This disengages the setting mechanism from the rest of the train which kicks into action when the stem is removed from these movements. If this lever isn’t pulled out then it can actually add enough drag to stop a watch that isn’t in perfect condition when testing out of the case and will appear like the motion train is stuck…like what you’re describing.
Here’s a description of the lever and what it does that we covered a couple of years ago up here:
http://www.clockrepairtips.com/forum/viewtopic.php?f=2&t=192
Please let us know what you come up with or if you have further questions.
Good luck and enjoy!
Bob