A number of members have had concerns of surging. Check out this link to a TSB that may resolve your problem. It address numerous items, but applies only if your vehicle was built before Nov. 17. Hope this helps.
Hey Les. the thread NitroLarry posted has a lot of information. There are other areas of interest if you will look back on some of the older threads too. Keep up with the transmission posting if this continues to be a problem. It can be fixed.