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Q: CEL, VSC, Trac off lights on; poor gas mileage and fuel odor in truck.... on 2003 Toyota 4Runner

I changed all 4 o2 sensors, replaced MAF and used injector cleaner and still have all the same issues going on. Could it be fuel pressure problems? Faulty Power train control module? I don't see any gas leaks. Please help because I have no clue what it could be. Thanks!
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