Originally Posted by wyldstallyn73
My guess is its your ignition switch has play in it and needs to be in just the right spot to make contact with everything.
I just had another thought along those lines, I had one that was just old and gummy, and when it got cold the grease was just stickly enough that it wouldn't come all the way back to the run position on its own, but just a slight amount of preasure would bring it into position and away you go.
Good call stallyn don't know why I didn't remember that one.