Strange Problem Getting Going
 

Hello all.
My wife's car, has an interment problem, it has occurred twice now.
both times it was on colder days and the engine was cold.

The problem is, the car will start like normal, then put it in gear and it will go a few feet and then engine will shut off. I shifted back into park then restarted the car with quite a bit of hesitation. After that the car rode like normal.
The first time it happened the engine restarted quickly

Any ideas on what could be the source of this one.

Many thanks in advance.
2002 Mercury Sable