I need some help with my wife's 2000 expedition it's a 4.6 and a couple nights ago I plugged in a break controller to the factory wiring it's all plug and play I unhooked it and when to bed the next morning on her way to work she called saying that the over drive button was blinking so it's been doing every since that day it don't do it right away it's usually about 15 minutes in to a drive don't seem to shift any different and it's not throwing a code so looking for some help thanks