Normal engine checks.
Well yes; I think most on here have probably come across a mag that makes the engine run rough during a ground run, however as Adam illustrates I don't think I have ever heard the suggestion that during flight it might be advisable to actually just turn one of them off...if I had had a similar situation to Adam's it may or may not have occurred to me to do what he did...whereas now I will forever have this thread in my mind when I have a rough running engine.
