why are cylinders 1,3,5 no firing i have replaced both coil packs and spark plug

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also replaced all cat converters i was having a problem of no power while accelerateing and when check engine lite came on it was putting out a code for engine missing i replaced coil packs & plugs and it ran the same pull down exhaust and found converters clogged replace all converters now im gettting cyl.1,3,5, not firing its driving me crazy can you please help me?????????