My '01 Nissan Sentra is having issues. I got really low on gas one night and then my "Service Engine Soon" light came on and the car started skipping out real bad. It is just missing real bad, it won't accelerate properly, the jumping is worse when I am stopped and even worse when I have the AC on. I have been told that it sounds like I am dragging a cylinder but have not been told how to fix it....ANY SUGGESTIONS??????????