Mine does the same thing when its cold. Doesn't want to get going and revs like crazy for about a mile and then it's fine. Only happens when the temps are below freezing.
I bought mine because I need a cheap car that was good on gas for my commute to work. It was either a spark or mirage, and I got the spark cheaper. Also there are a lot of Chevy dealers here and no Mitsubishi dealers within 50 miles.