Sounds like somethings not aligned in the column linkages when the key is in the "run" position.
I read in another forum that something on the far end of the column works loose causing different problems, like yours for one.
I don't recall what it was, but simply tightening it back to normal fixed the problem.
If you need an overview of the column assembly,
CHECK HERE , look through my makeshift index for "1996 Steering Column"
TTFN