Hi,y'all ! I'm new to forum,and I'm hoping ya'll might be able to help me ! I have an 07 Tahoe. A few weeks ago I got bad gas. Tank has been flushed, fuel cleaner has been added,as well as something to get rid of the water. I'm on my second tank of good gas. It's in limp mode, and throwing codes (fuel trim system rich bank 2,Fuel mixture imbalance,and evaporative emission control system leak). What do I do ?! I can't afford to take it back to a mechanic!