Guys the battery is in good shape and fairly new. Gas cap is tight. The light flashes on and off and varies with acceleration and deceleration. It now seems to be on as much as off. It first started about 2 years ago and seemed to do it when backing off. This led me to think it was something to do with emissions. I'm just amazed that not even a Ford dealer can get a reading from OBD1. By thy way, there are Ford specific OBD1 scanners. My local dealer said that they did not work on older vehicles enough to have one. UNREAL!!