Trying to help a friend here....any one know what could be causing the check engine light to flash steadily on a 2005 Fusion 900? When coming to a stop it shuts off and stays off once you go again until you reach a certain rpm and then it flashes steadily. (Sorry I dont know what rpm that happens at) He has looked at the code book, but of course nothing matching this is in there. Next step was to take to a dealer to check it out, but thought I'd ask around to see if anyone has had a similar issue.