brushless problems

The fact that you haven't run it in a while may be the problem. Check all of your connections and make sure that they have been coated over with any sort of corrosion. Try wiping all of the connections with some denatured alcohol. The stuttering may be a sign of a bad connection.

If there's smoke, somethins burnin'. You have to figure out what it is. This too may be a result of a bad connection.