Here is what is going on. I left work to day and about 5 miles from there I felt an odd shutter. I thought to myself “that is odd” and looked in the review mirror just to make sure that I didn’t just run something over (not that lucky). So I turned off the radio and I waited, about a half mile later it did it again. This time I could hear it and feel it, the only way that I can describe it is almost as if tires were just about to lock up but then didn’t. It continued to do this until I was able to exit the freeway about 3 to 4 miles down the road and then stopped. I was doing about 65 the first time it happened and then about 55 the rest of the times. I thought that maybe some how it wasn’t fully in gear so I switched it into neutral and then back into gear and it still continued to do this. Once I got home I tried to think what it could be and then wanted to see if I could get it to do it again and of course it wouldn’t. It is a 2003 4x4 and is an automatic. If any one has ever experienced this, have any ideas or suggestions I would be greatly appreciative.