My son did this exact same thing! I talked to my pedi and he suggested I keep a log of what he was saying, what was going on at the time, etc. for a day. The log was very helpful. We did meet with the ECI person - they were great. The case worker determined (through playing and talking with my son and watching him play with friends at home) that he didn't need special help. She seemed to think that the problem was basically he was thinking faster than he was able to get the words out, causing frustration, which brought on the other high-strung-like behaviors. She said he was aware that it wasn't coming out like he wanted it to and that he was sensitive to that. She suggested that we just let him take as much time as he needed to say something. She also suggested that if he's noticibly upset to have him stop, take a deep breath, think about the words, then say them. Then we repeat back what we heard him say so he'll know we understood his point. She said it is very common in verbally advanced children and that he'd be able to work through it - and he did. It lessened over time and is completely gone now. Hang in there. Don't be afraid to call ECI - they are great and you'll gain some peace of mind. Try the log idea - the more data you can produce for the experts, the better!