Just while cruising. I talked to a mechanic on the phone and he said it definatly wouln't be the vehicle speed sensor. The one I talked to send to see if anything was loose in the distributer? I called a couple of places and two said that it could be a bad instrument cluster, and some said it was an electrical issue? They said to take it to dealer to check out. I am somewhat confused, so i will probably just do that instead of paying 80.00 for a diagnostic (that probably won't do anything since I don't have a CEL) and then be told to take it to a dealer.