Unexplainable Transmission Stutter... help?

I think my timing light is on my work bench somewhere..maybe. I don't use it anymore. Every motor is different in what it likes. Turn the distributor with it running, to the highest idle; then go as far retard as possible while still maintaining the highest idle; there's a large window of high idle operation; usually. Also, try manifold vacuum to the advance then ported vacuum. Reset the timing each time; it will respond differently. Sometimes night and day; depends on what your motor likes.