i just got a 04 2500 5.7 Hemi, bogs down, slow acceleration, and horrible gas millage.When i get on the high way the problem stops. I threw it on a scanner, and said all the O2 sensors were bad. I replaced them, but no luck. A mechanic thats a friend of mine said it might be clogged cats. Cut the cats out, and it helpd the problem but it still acts up a little bit. I can hammer down on the gas and it clears out the problem for a while. Could it possibly be an injector? or Maybe the PCM Computer?

 

Have you ever disconnected the battery for about 15 mins to clear everything out and reset it?

 

no. what exactly would it clear out?

 

it resets the driving parameters that may have been adjusted by the computer to compensate for bad sensors etc.

 

^^^^^^^^. Yes, this.

 

Didn't help. :/. Is there a way to find out if the PCM is fried? Or easy way to tell if bad injector? Another person said it could also be the timing.? I hooked back up to a scanner and all O2 sensor codes are on again. Po132 Po135 Po141 Po161. I think the O2 sensor codes might be from when the cats were cut out, there's a small exhaust leak.

 

You need more than a code scanner, you need to hook it up to a live monitor and see what each of your cylinders are doing, It sounds like bad spark or clogged injector to me but only a live OBD feed will say for sure. First thing is first though, fix your exhaust leak.

 

Who has live monitors? Just dealerships or mechanics?

 

its not really that high end of a piece of equipment, many tuners and good OBD scanners have usb ports to output live data to a laptop. If you have any mechanically handy friends you could ask them, otherwise i'm not sure where else other than garages.

 

Alright thanks. I'll look around and see what I can find. Thanks for the help! I'll let you know if I find one!