Ok guys, im getting worried. i have an 2005 5.7 hemi and im getting an error codes p0456 - p0152 - and sometimes p0420 but the p0420 isnt showing as of lately.

the real and noticeable problem is trucks is slugish but usually until 50 ish speeds. seems like as i try to give it alittle gas it just doesnt want to pick up speed.

now if i make it shift it goes but just bogs back down if i lift from making it shift. hope its not the cat,how can i tell and is there a way to test it out at home? not sure about these codes i posted?? it has 92,600 miles and i never towed with it, only coal during winter... any help guys would be great..

hope im not hurting it, this has been on going for awhile just worse now..

 

Change plugs, clean throttle body, replace air filter, use good injection cleaner, reset pcm

As for the codes, the 420 is a cat code. Could be a bad o2, could be a leak at the manifold(s) due to a crack or broken exh bolts