1997 Volvo Other

I have an 850 model, 1997 Volvo with 161, 000 miles on it, yes, its been a great car: )
I take very good care of it, always in for its upkeep and such. But lately its been sputtering or not even starting when I try to start it. Then, once we are on the road it has revved up on its own at a stoplight, scared the hell out of me, what could be causing this?
October 12, 2006.

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