Here's the scenario: I'm driving, I have my foot very steadily on the gas. I let my foot up just barely (like not even enough for the speedometer to drop) and my car shifts itself into overdrive. Same thing when I barely put more pressure on the accelerator. And now, when I don't move my foot on or off the gas pedal at all, it just constantly shifts in and out of overdrive all the time, all on its own! (Even on a flat, straight road) This is definately not normal, please help me! (This car is an automatic, by the way).