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Mazda millennia 2000 when connected mass air flow sensor miss fire and stop runi on 2000 Mazda Millenia

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without mass airflow connected engine miss fire and stop running when is conected, new cap rotor wires spark plugs tried with another mass air flow sensor and do the same
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miss fire cylinder 3 first one the cat got overheated and clog the mass air will make the engine to miss fire when I convey back with out the car start idle right and flame come out off the exhoust. Please help
code P0303 also P0305, P0101.
You need to let a mechanic check this out for you. All i can do is guess at what is wrong!
Recheck your plug wires to make sure firing order is correct. That is about it!
May have 3 & 5 crossed.
IF the converter is restricted , the engine is not BREATHING right. MAF will not have correct readings for conditions.