Thank you to the both of you for the info! Iolder, the only time the car ran like this on the gas engine was during this "Check Brake System" issue, we've had the car since we bought it brand new in May 2011. So it was only this summer and now that this happened. During the summer the cold wasn't the issue, though right now I guess it could be, but we've had colder winters before and it was fine. I will definitely be bringing it in soon! Crystal, I will definitely be in touch within the next week, we want to get this resolved ASAP. Thank you!