fuel injection flush on 1994 Dodge Caravan

I need to know if my van 4 cylinder, 1994 mini van, should have a fuel injection flush? If it is done what can happen to my van? what would be the cost to have it done and also the cost of a fuel injection replaced?

An Injector flush is about $90-100 dollars. You can do just as good if not a better job by buying a 20 oz bottle of Techron and adding it to a full tank.