..here is the timeline. V50 gets oil change at dealer, car leaves dealer runs fine. Car gets gas at new fleet station I wanted to try..cheaper gas. Car runs fine that day. Next day hop on highway go 200 miles, then car stats to run real rough, idles like 3 cyl. Check engine light comes on! I suspect bad gas, put in 2 dry gas, continue to destination..no change. At destination, pop hood discover the vac hose with the EGR valve is not connected to the air intake..after the mass air sensor. I connected it thinking problem solved...no change. At this point getting the code read is out of the question for now. So I was wondering... I know the oil change is hard on this car..is there another vac hose that the dealer could have disconected that we can't see? Because now we think it a vac problem....but it could be a injector problem also...any help greatly appreciated. Bill