I am not familiar with the 4.6 v8's, other than what I have read.
but intermittant no start, stalling has been traced to a bad crank sensor. dont know if they can be tested, but if you can find it (I imagine its pretty tightly squeezed in there on the conti's), try to clean the connector first. if that helps, then I would replace it.
I am sure there are other people here that have more knowledge of the 4.6 than I that can help more. I am just going with what I have read, and common sense. The 4.6 in the conti and in the TC are very similar (nearly the same, main differences are for the FWD vs RWD, and different heads)