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A misfire could be caused by what you have already looked in to, spark plug, ignition wire(s), coil, and injectors. Since you have done all of that, next thing would be to guess that there is a valve issue usually caused by carbon buildup in the engine. This may cause a particular cylinder to misfire. Try a bottle of a fuel additive called
Techron. It is made by Chevron. Use the concentrated formula usually in a black plastic bottle. It should clean things up. You may need 2 treatments, if so, you must do an engine oil change after the 2nd treatment.
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