Check Engine Light

Since we bought this used from a local dealer, about three months ago, we have been chasing a "phantom" check engine light. This was initially accompanied by a stalling problem when the engine was first started from a cold condition. The code was "P01" or some such, indicating too lean a fule supply. After the dealer replaced the fuel pump, fuel filter, gas cap, MAF sensor, 02 sensor, and de-carbonized the engine, it runs fine, but then the check engine light comes back on. Any ideas out there as to what might be the problem?

If you have an Autozone around you, have them check to see what code(s) are in your computer, then go from there.