Mass air flow sensor
A mass air flow sensor is going to affect both banks not just one
Need to monitor the bank 2 oxygen sensor signal and see if its pegged lean(low voltage) it might be a wideband o2 so ud wanna look at the milliamps(would above 0). U cld try to introduce some kind of carb clean to try and drive it rich... if you cant then its possibly shorted to ground or a fault sensor
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