Yup when the tune is set where the a/f ratio is set to lean that is a real problem, I started out rich which wasn't that bad, best way to determine is go to a dynotuner, a good one and see what can be done to correct the a/f ratio. and about if it can be downloaded yes it can, that's how I got my tune from my original tuner in Alabama. My sport trac currently has 49500 miles on it by the way.