I have a 2003 Suburban with 279K miles on it. It is not my primary vehicle, and I really do not want to put a lot of money into it. I took it to the auto parts store and it is showing codes P0300, P0171, P0174, and P0332. These codes seem to revolve around fuel mix (air to fuel ratio) and engine misfire. Deficient fuel being burned in a cylinder. The suburban appears to be running fine other than the blinking light. Is this something I can ignore for a while? Or could it be an inexpensive fix at the shop? Frankly I would sell the car, but don't want to dump and old rig on some fellow or family that might depend on it running..