What would make my car dump excessive gas causing it to smoke

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I had car checked for codes and was told that the injector circuits were stuck open .. I had the ECM replaced and it solved the problem briefly ..... But the smoking reoccured ... I have replaced the heads/gasket , water pump, radiator , thermostat , coil packs , spark plugs , gas tank , injectors and ECM unit .. It ran good for about 3 weeks now the problem has returned .... Could it be the heads are gone again