We can't figure out the problem...

What is your question?

My uncle has a 1995 Mercury Cougar xr7 with a V8 engine... recently shes been stalling out on us and refusing to start...Sometimes when we stop to turn she wont accelerate, we have hooked the car up to a computer that is supposed to diagnose the problem and it showed that it was the mass airflow sensor so we replaced it, then it showed that the EGR sensor was the problem so we replaced that but shes only gotten worse and we can't figure out what the problem is....Has anyone else suffered these problems?