stalling/rough idle

What is your question?

When car is started and put in drive or reverse car starts idleing very rough. also idles rough when stoped. also car tends to just stall out of no where every so often usually after driving for about 20 to 30 minutes. all ready replaced egr valve, throttle position sensor, fuel filter all vacuum hose's that i could see that are damaged. any ideas as to what else could be causeing this problem. thinking possibly two seperate problems?