Last year in October, I took a trip to Austin, TX and on the way back to Kansas, my car started hesitating and tugging, it would not accelerate, even if I put my foot to the floor and as soon as I would pull over, the car would turn off. I would wait for five - ten minutes and then the car would turn over and be fine. I would drive for about 15 minutes and then I would have to do the same thing all over again. As soon as I got where there were less hills, the problem went away. I was able to get home and had the CEL read. It said that cylinder # 2 was misfiring. I replaced the spark plugs, wires, PCV valve, fuel filter, and the coil pack, just to make sure the problem was fixed. I had no problems until this weekend. On my way to Laramie WY, the same thing started happening, but this time when I would pull the car would seem fine. I would turn it off and I could drive fine. This happned about three times, but was able to make it to Laramie and back to Kansas. Could the fuel pump be going bad? If not, what might be wrong? This time the CEL light did not come on. Any suggestions?