Hallo!!

I have a problem with my Impreza MY99.
Yesterday Me and A friend of mine went out to look at musclecars.
and when we desided to get someting to drink we took our cars and whent to a nerby petrolstation.
He took the freeway and I took the backway.
When I came to a inersection the car stoped. So I turned it on again. And it satrted as it should and sounded as it should. But it stopped after about 5sek.

What is the problem?

//Daniel