Knowing Bob as I do and knowing his meticulous detail I have a feeling he is waiting for the correct moment to publish his easy logical series of actions.
llanfairpg, I wish!
My observation is that many replies focus on the procedural aspects of addressing the rough running engine. I was interested to see how much emphasis was put on pointing the a/c (I am assuming single engine) towards the nearest suitable aerodrome and (if possible) gaining height before executing a forced landing from the overhead.
As various posters have indicated there are a lot of variables, hence no strictly right answer - my question was deliberately vague - I wonder who taught me that...............