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i agree with coil packs as an issue. it is odd, however, that it is swinging from one bank to the other. bad spark could be due to fouling of plugs, but then one would expect sign of oil in exhaust. perhaps also bad spark/misfire due to leaking injectors, but codes should indicate mix problems. similarly, symptoms also indicate potential fuel delivery problems (plugged filter, bad pump or pressure regulator) but again codes should indicate mix problems.
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