Sometimes problems can start off with a simple issue. Has the vehicle sat for long periods, possibly letting the battery die? These vehicles need good stable voltage, or issues pop up easily, or you can damage modules.
My next question though, if it is getting all these misfires with new plugs and coils, and injectors, would be if a compression test has been done? The motor could be hurt, or it could have bad buildup keeping the valves from sealing fully etc. Not sure how your fuel quality is there, if that could be a factor in injectors getting gummed up quickly etc.
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