The first part about tunring the key back to the run posistion sounds like the ignition switch is bad.
Pull a plug wire off, ground it too the head (So it sparks) and have someone crank it as you described. See if the spark stops when it quits being cranked.
Giggle it around when you turn it back to run. See if that matters any.
What was the last thing you replaced or worked on before it quit running?
Keep us posted.
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