BRUCE410

I just bought this car a month ago with 280 miles on it, and have 1800 on it now. The car has developed a rough idle problem anytime your sitting stopped and ocasionally acts like it might die on you, but hasn't. I've had it into the dealership twice now under warranty and they can't find a problem with it. It's not throwing any codes so they don't know what the problem is. I even thought possibly that because the car sat up for two years that there might be a problem with old fuel varnishing, however I had them flush the fuel system and change the fuel filter - no change. One other symptom in this scenario is what I might consider a low RPM issue in that (at times) when you slow to head into a turn, and throughout the turn the steering is tougher than it shoud be. Once you straighten out from the turn and accelerate, everything returns to normal. It's very frusting, so any help here would be greatly appreciate.
Thanks