what would cause the eml light to come on, when the car will barely move?

I am having the exact same problem. I was just wanted to clarify that you put a quart of oil in the engine and a pint of water....... in the radiator?

That means the emergency light. When 1 or more of the potentiometers fail the light will illuminate and the MDK Motor Driven Throttle Valve will deactivate, putting you in a reduced power mode. Have your system tested for faults before it leaves you stuck on the freeway.