This is something that has happened maybe 5 or 6 times over the life of
my 2001 Dakota (4x4, 4.7l v8).  Normally, this happens if I've backed up
and nearly stalled the truck: pilot error.  Did it the first time during
the first couple of hours that I owned it (then didn't do it again for
nearly a year).  This time, it happened in heavy, slow traffic, starting
to move out from a stop.  It doesn't throw any codes, just still has the
P0455 which I have to do something about someday (evaporative emissions
leak; I've replaced the gas cap).

What the truck does is essentially nothing:  I give it gas, it gives me
nothing (sometimes a very weak attempt to rev), just anemically tries,
but doesn't quite, stall.  The only way to get the truck moving is to
shut it off, then back on, then it works fine.

I'm guessing something in the computer gets 'confused' but I'm wondering
if anybody knows exactly what is happening, and if it's fixable.
Because it's so very intermittent (like I said, maybe 6 times in 5
years) I've never tried to take it to a dealer.

Doubt this has anything to do with it, but the previous day we had a
very exciting morning driving through a blizzard in the Scottish
Highlands (Glencoe and Rannoch Moor, for those who are familiar), as the
only vehicle on the road (it was closed at both ends, we found out
later), after we got by all the stuck vehicles.  Quite a bit of time in
4LO on unplowed roads, and some 4hi on very iffy footing.  Was the most
4x4 I've ever done in this truck.  Had a lot of fun though.  Weather was
so bad we spent an hour waiting to get off the moor, because the snow
plow itself got stuck!

jmc