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catalytic converter gets red hot on 1997 Buick Park Avenue

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i had valve seal problem and map sensor needed the old cat was red hot with flames when i removed cat insides were broken apart replaced cat replaced oil seals,map sensor,engine runs well idles well doesn't take the gas well i think there may be blockage but not sure what else could cause the cat to get red hot am getting po102 mass air flow sensor circuit-low frequency detected. thank you LC
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