When I started my car to go home, it would only drive at 20km/hr no matter how much gas I gave it. I had to drive 25km at 20km/hr (slower on the uphills) to get home. The sensor was apparently registering that the car was idling, so it would not respond to the accelerator. Lucky for me I could take a back road most of the way home. The back road is in a farming area, so it conveniently had a sign posted 'Caution: Slow Moving Vehicles'. Felt right at home - it couldn't get any better than that!