I've got a 2004 1500 4.7. My Engine is pretty noisy although it seems to run fine. The check engine light is on and I get codes P0456, P0440, and P0430. Any suggestions other than taking it to an expensive mechanic which I can't really afford right now.

 

Ok, the first two codes you listed should be for your EVAP system, check and replace your gas cap as a starting point, then check all the hose clamps for tightness the last code is for your CAT system efficiency, sounds like either your CAT is plugged or an o2 sensor is gone.