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It sounds like you need to check the injectors or injector harness to get that #5 injector firing properly before worrying about the other codes. I saw there is a TSB for electrical harness for 1999 Firebirds TSB 03-06-04-012A to inspect the harness but it doesn't give any specifics. Maybe a good scan tool will show if the #5 injector is truly getting the signal to the injector.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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