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Q: 2006 buick lucerne cxs 4.6 cylinder 7 misfire changed coil no fix, ordered injec on 2006 Buick Lucerne

2006 buick lucerne cxs 4.6 cylinder 7 misfire changed coil no fix, ordered injector, pulled injector wire no change in engine idle. pulled cylinder 1 injector wire substantial misfire noticed. if injctor does not fix is there a fuel computer or just ECU. any suggestions. thank you Chip
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I REPLACED SPARK PLUG, COIL, INJECTOR, COULD IT BE THE ECU. IS CYLINDER # 7 BANK CLOSEST TO REAR OF CAR AND LAST CYLINDER CLOSEST TO TRANSMISSION
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