1993 Jeep Cherokee Jerking and sputtering

Our Jeep is jerking and sputtering. First we changed the Fuel Filter. Still does it. Then we changed the spark plugs, it stopped for 3 days then it did it again. Three of the spark plugs were corroded and one was black and had a strong fuel smell like it was not burning the fuel. We did not change the wires this time. We are going to check the new plugs to see how they look and change the wires.
The Jeep does a sputtering jerking thing and it accelerates and releases. It does it mainly when we exceed 55 and when we go up a bring. Where we live there are several bridges. We need to keep this Jeep running until we finish fixing our Cavalier.
What else could be the problem? Would it be a censor or other wires?