2004 Chevy Venture Car pulls--doesn't handle well

Hi, I have a 2004 Chevy Venture that was making a popping noise from underneath a few days ago--I noticed that now the car pulls to the right, and when you make a left hand turn the right rear feels like it is bottoming out. When driving over 50, it feels like you don't have control over the vehicle, and it feels like something is dragging on the wheels--as soon as you take your foot off the gas, the speed just drops like a rock. Could this be a sway bar issue?