I need some Help here.I have a 2002 Durango and it just started making a Knocking sound in the engine on the drivers side? The Check engine light is on and the Code readings I got p0301,p0456 and p0442 Any Ideas How to Fix These Problems..I need Help..

Thanks
BT

 

start out looking at the gas cap for the evap leaks, but since it is more than a small leak i would also look at the evap (vacuum) hoses under the hood and going into the charcoal canister under the body of the truck (about even w/ driver seat)

the cylinder one misfire could be related, or it could be another problem, but we need more information to help with that, what engine do you have in the truck, and when/what was the last maintenance done to the truck

 

I Have The 4.7L Engine.The Last maintenance done was an Oil Change.It Has 95k Miles

The Oil Change was done Like 4 days ago and The Knocking Noise Started like the day before I got the Oil Change

I Have The 4.7L Engine.The Last maintenance done was an Oil Change.It Has 95k Miles.The Oil Change was done Like 4 days ago and The Knocking Noise Started like the day before I got the Oil Change

 

when did you last change the spark plugs? and did you use copper core champion plugs? (gapped to .040), you could also try running some seafoam through the tank to clean the injectors out