When starting in cold weather, the car races and then almost stalls (revs go between 400 to 2300), after it warms up it's fine.

I would look at the coolant temp sensor.  The sensor is what controls the idle when temp is below a certain degree so it wont stall because it is cold.  To over ride this feature you need to press the gas pedal to the floor then start it.  If it works as it should go to your local parts store and buy a coolant temp sensor and change it out.  If you are not familiar with your car you can buy a Haynes manual and it will walk you through the process step by step.