2005 Hyundai Elantra Q&A

2005 Hyundai Elantra Question: my check engine light is on, and a tune up was done

was told oxygen sensor needs to be replace but after driving for a while check engine light comes on again. I have changed both oxygen sensors,the spark plugs and wires,the mission/master(not sure of name) coil, and when I take it to Advance Auto to have a diagnosis done,with Actron Autoscanne, it states all the cylinders 1-4 are misfiring and on circiut 1 injector circut higher -
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