Your giving a % but not giving a + or -. if it is + then ignore leaking injector etc etc as the ECM is commanding an increase. If a - then it is trying to subract so have to look for ways of unwanted fuel, that would be leaking injector etc etc. if a + trim first thing I would maybe try is disconnect both MAF sensor to put into a default open loop mode and see what the a/f is measuring. If it sees it as super lean then possibly an exhaust leak drawing air in or a poor sensor/wiring. It's late I'll see if something else comes to mind.
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