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Well i had a problem of a broke spark plug in the head that we couldnt ezout so we tore it down and put a rebuilt head on. well after putting everything together it didnt run proper. It idled fin but up around 2500 RPM an WOT it would just stutter around the rpms bounceing back and forth with ZERO power. checked the timing chain (DAMN THE THING HAS ONLY ONE MARK) and ater days could only come up with the right chain setting.

the only code it throws is 2 codes for the o2 sensors saying sensor 1 bank 1 and sensor 2 bank one are not operating right... is that the prob? i thought it shouldnt be saying 02's are for emittions purposes.

HELP!!!
 

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2018 Nissan Pathfinder SL
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sounds like it in limp home mode.
fix the codes.
O2 controls the mixture....
 
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