I got this nagging issue with my '08G8GT....My Check Engine light comes on regularly...definitely not the gas cap. I had axel back exaust mod's which really just consist of changing the existing mufflers to Flow Masters. No other mods have been made, yet. She also runs a little rough a idle which leads me to believe a Vac hose connection may have come loose......Any ideas???or has anyone else had tis problem.
Had the local AutoZone pull the codes.....Mass Air Flow error, all fingers point to the new exaust system. also, I am in the market for a loader/chip for this car and have had no luck finding one. Any one know where I can purchase one?