1996 Geo Metro Problem Starting when Cold

Thanks for the advice by the way do u know where the coolant senser is located :

Ok so I changed my coolant temperature sensor car starts up nice even when cold thats cool. Now when the engine is cold I still have to wait till it warms up because once I give it gas and let go the engine wont idle it will die. Once the engine heats up though it runs fine.

Another thing I realized is the wierdest thing in the world, if I turn my head lights or parking lights on the car will idle high and low but once I turn them off the car instantly gose back to normal. Hmmmm I wonder what that is all about.

Well plz help once again, I HATE car problems.