1997 Dodge Avenger EGR valve

I have a 1997 dodge avenger that has 229,000miles but runs like a champ. I have had it scanned many times and it pulls up the egr. When the car went in to the shop to replace a radiator and thermostat, they had said it was stuck open cuz I have a cel that stays on. Now the car has a rough idle, wants to die when stopping at a light or stop sign. And just yesterday when I went to start it, it started but then died. We pushed on the gas to get it to start but it drained my battery. We then charged it and got it to start but when you take your foot off the gas it dies. Before I buy any parts im trying to figure out if its the vacuum on the egr or do I just buy a new egr valve