What would make my car jerk and overheat?

I have a 1994 Saturn Station Wagon SW2. The gas meter and the mileage meter do not work. My car jerks when I accelerate and slow down. It feels like it is running out of gas. Today the car would not accelerate past 40 miles an hour until I started down a hill. The car also overheats very easily. When sitting idle the car heats faster then usual. I have had the sparks and the wires and the gasket cover. The add water light stays on but i think that goes along with the overheating problem. I add water to the car everyday. The check engine light came on after we changed the plugs, wires, and gasket cover but I was told that it was normal for an older car. Anyone able to help me out and let me know what I need to do?
 
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