I have a 2006 v6 Eddie Bauer explorer engine light is on changed fuel cap still on, what else can I do?

why did the light come on in the first place? Need a little more information

Are you serious, I thought you were the professional, and you are asking me????

well without any information its a little hard lets see all you said was the check engine light is on and you changed a fuel cap there are hundreds of reasons for the light being on but without knowing what the vehicle is doing or when it started i cannot really help you hense no1 else has responded to your question NEI

I also have a 2006 Ford (Exploder) Explorer Eddie Bauer, and I have taken to the mechanic and the code reading at first was P0303. They could not figure out what else was wrong even after they changed spark plugs,ignition wires and cleaned out fuel injectors. Anyway they put sea foam and fill her up with gas, and drove it until 1/4 tank. Took Exploder back to the mechanic like we agreed I would bcz he said engine light would turn back on. Anyway, I go back just so he could say he did not know what else could be wrong with it. This time it is reading P0304. So now he thinks it could be that the computer needs update. So the symptoms are that no matter how much I accelerate it seems that it has no power until I hit the 50 mile/hr mark and it idles when I completely stop. Any thought about what it could be? Oh and I have heard I believe is the serpentine belt churping at times too. Would that be serpentine belt or pulley that needs to be replaced?