My car died, please help?

I have a 98 volvo awd sport wagon. It started acting up a few days ago, bucking, dash lit up (abs, traction, check engine lights). Today while driving, the car started bucking really bad, then died. What is the problem? Easy fix? Where do I get parts from? All the help you can offer me would be great and thank you. PS I did just fill up yesterday at Valero, I don't know if that matters or not...