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3.8 supercharger L67 dtc code po300 random singled out cylinder 3 replaced the map goes out replaced then maf replaced then fuel is in oil replaced oil code po300 replaced coils I replaced injectors no cataylic converter just pipe not using o² under car but am using o2 heated have a rear manifold leak can't seem to find it is it possible for engine area to crack so thin it leaks out but doesn't break the shell of engine like a thin slice 2 finger I welcome n e and all advice
Lost looking for the light gtp
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