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05 5.7 hemi slugish - underpower?!?!?


Old 11-03-2013, 09:35 PM
catawissarocket is offline
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Default 05 5.7 hemi slugish - underpower?!?!?

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..
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Old 11-03-2013, 11:18 PM
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weedahoe is offline
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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
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