why cuts off when come to a stop,it will not stay idled when in drive at a stop

What is your question?

has 200,000 + miles , just had new starter , new water pump , time and belt, ,but whenever i come to a stop with the vehicle in drive it cuts off unless i put it in neutral and give it gas. Usually if it is in park will not cut off. The alternator was also bad so replaced it thinking it may have had something to do with it stalling. Still stalling help