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this has brand new cat on it ?
this has NO vacuum leaks from the bottom of the lower of the intake manifold ?
with confirmed good cat and its just that one bank and there are NO vacuum leaks on that bank then the only other thing to cause a fuel control issue on one bank is the O2 sensors on that bank being bad giving wrong readings to the computer to dump in too much fuel or the rare chance the injectors for that bank are dirty or there ir rust or dirt in them or in the fuel rail for that bank
nothing else will cause a bank to do this
again be SURE the cat is good
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