> I have a 01 Ford Explorer that idles erratically.  It does not effect
> the car as you are driving at normal speeds just when idling.  The
> check engine light has also come on.  The codes are bank 1 and 2 are
> running lean.   I have replaced the fuel filter and the spark plugs are
> new so the only thing I could come up with is that there is a problem
> with the fuel pump or the pressure regulator.  Thank you for any help.