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Hi all. I have an 04 Sonata, 4 cyl that has displayed codes for #3 and #4 cylinders misfiring. So far I have changed all plugs, wires, both ignition coils and ran through a tank of gas with fuel injection cleaner. None of this has helped, car still runs rough, very sluggish off the start, rough idle and spark knocks under a load. Anyone else experienced this? What else should I be looking at?

Thanks in advance.
 
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