2005 Dodge Stratus

My stratus has stalled twice on me it runs fine then all of a sudden it sputters like its outta gas 1st time I let it set overnight put gas it ran fine for a week then it did it again the gas gage shows 1/4 of a tank bothe times it was withen 15 min of starting the car nad it was also in the afternoon it is about 90 degseas here and it happend in tha afternoon any ideas please help