I was driving down the interstate in Omaha, Ne. tonight at 65 mph. I decided to get some gas and head home. All of a sudden I feel the car driving a little rough. It kept doing that until I hit the exit to get some gas. As I got off the exit the motor was really rough as I tried to get to the station and was going about 20 mph. I was thinking that maybe the tranny was going out. I got gas and headed out to get back on the interstate. It was hard going trying to go up the entrance to the interstate and I had to wave a driver behind me to pass me. I got off the interstate to get on a highway that wouldn't have much traffic and I could drive a little slower. I was just hoping to make it home (about 60 miles away). The speed limit is 60 but I managed to get up to 50 to an intersection where it would change to 70 mph. I got up to 60 and after that the car ran OK. I drove to the next town about 15 miles away and stopped at a Wal-Mart to get some stuff cause it looked like the car might make it home. I made it through the town and got back on the highway at 55mph. I had to go through 2 more towns but made it. The car just runs bad between 15 and 35 mph as you try to accelerate. Maybe something broke or got loose on the interstate (I'm hoping). I'm going to take it to a car parts place and see if they can hook one of those testers to it to see what the problem might be. The car is a 2013 Nissan Versa and has over 220,000 miles on it. I'm going to buy another Versa about the same year with lower miles in a couple of months but I'd like to drive this again until then. Any ideas about what might be wrong with the car?