No
I would not expect a valve cover leak to cause a car to stall. A valve cover leak can fill the spark plug area with oil which can cause rough running.
no it will not...
It could.
Even a good EGR valve may cause an engine to stall in hot weather.
Look for a hole in the PCV valve hose on the backside of the engine.
Start and stall out, possibly. Not start at all, not likely.
Check the EGR valve. It sounds like your EGR valve is staying open. An EGR valve that is open at idle will cause a car to stall. An EGR should be closed at idle and open when you are driving around.
Check the Park Avenue EGR valve for a clog. A clogged valve can cause a rough idle and stall at a light.
It might be that your pcv valve is plugged or the egr valve is sticking.
There can be several things that will cause your 2000 Dodge Durango transmission to slip into reverse. A malfunctioning slave valve can cause this to happen.
If the valves are incorrectly adjusted it will hurt performance.
Try cleaning the EGR valve.