Car starts and stops, starts again and it stops again in Parking?

I had the timming belt changed/alternator belt changed 2 weeks ago.

Now my car starts and stops and again starts and stops ..

What do u think it might be the problem?
Car starts and stops, starts again and it stops again in Parking?
well without knowing what the vehicle is

or what kind/size engine it has in it



i would say it has something to do with fuel