Car stalls. Idles weird

Stop changing parts without testing! How much money have you wasted on parts that have not resolved your concern? Testing is needed. Any trouble codes? What does the data stream look like for air coming in, exhaust gases, EGR system operation? How is the engine timing? Cylinder compression? Is there good exhaust flow? What is base fuel pressure from the fuel pump? This is all needed information that will reveal what is going on with your vehicle and why the concern is occurring.