I also have a 98 c1500 v6 with about 250000 miles started sputtering/misfiring on highway at high…

I also have a 98 c1500 v6 with about 250000 miles started sputtering/misfiring on highway at high speeds then started doing it more often at low speed also I thought it'd be the fuel pump so I wanted to start off with the least expensive things so I changed fuel filter spark plugs wires and it seemed worse so I took to a nearby shop and they told me it was the spyder injectors I replaced that and still the same but not as bad any suggestions?

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