Just because a cap doesn't leak at the low voltage provided by a VOM
does not mean it isn't leaking at working voltage. Try substituting
another cap and see if it helps. My outside air conditioning unit was
doing exactly the same thing. Diagnosis: bad starting cap. If your
motor uses two caps (one for start, one for run) check the centrufugal
switch
that controls the caps to see if it is broken.
Good luck. 73 Gary