How to resolve p1174 issue 2008 Chevy Uplander

Hello, this is an "air - fuel imbalance for bank 1". This means that there's a specific concern with bank one alone, if that's the only code. Measure your fuel trims with a diagnostic tool. What do you see, in comparison to bank 2? You'll need a good diagnostic tool to accomplish this. Are you using original equipment General Motors parts? Check wiring, check connections. Think specific to bank 1 -- what could be a concern? Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops