The check engine light came on a couple of weeks ago on my 2003 Taurus SE. The car has a bit of a rough idle and I've noticed that it luggs a little when driving. I'm still getting good gas mileage - 26mpg. I took it to Autozone and found the following code: P1131 - Fuel Error Metering Manf. Control. Any ideas on what this could be? Thanks!!