Car suddenly lost power. Original owner 204,000 miles

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While driving,everything fine then suddenly and without prior problems, lost power. Pulled over checked under the hood. No smoking, no leaking of anything and serpentine belt was fine. Replaced radiator two months ago. Had one head gasket seal replaced year and a half ago. It could be a number of things since we haven"t done a whole lot of major maintenance on the vehicle.Original tranny fluid too. It has regular oil changes and is in great condition considering her age.