04 2500 5.7. not long ago it runs ruff at idle. but when give it gas it runs great, only at idle the ruff running. I had the mil light come on and shows a random miss fire and bank 1 sensor 1 low volts. today it ran like poop with a random missing up to 2k and then I floored it and it went away the problem. but still have the ruff idle. trying ti get some ides out there before I get neck deep in this. thanks

 

Hard to help you without you posting the exact PXXXX codes that you witnessed, so check the Spark Plugs, if worn replace them with COPPER CORE PLUGS and gap them according to your owners manual.

Next thing it could be is the Throttle Position Sensor (TPS), or a clogged/damaged fuel injector.

I'm guessing it's a spark plug or even a bad coil...

 

A follow up question to this, you recommend copper plugs, which I've seen referenced on here before. I had plugs replaced last fall and didn't know this advice at the time so the shop recommended platinum (apparently they don't know much about Hemi's either) and I went with that. I'm noticing some fairly consistent throttle/power under performance and wondering if the plugs sound like the culprit. I have had just about everything else I can think of checked out that could be causing the problem, so now I'm wondering if something as simple as the wrong plugs could be the issue. When I told the dealership I had platinums put in they immediately said that was the most likely issue, so I'm wondering if anyone else is running platinums with no problems or if this is a consistent issue for people who put in something other than a copper core plug.

Thanks

 

It's a common issue, but some guys do run platinum plugs without a problem.

Put Copper core plugs in there and see if it fixes the problem.

How many plugs did that shop replace for you? (Hint: It SHOULD be 16 plugs)

 

 

Any Main Stream Brand of Copper Core plugs are okay... they are extremely cheap... I can't believe a shop charged you $300 for a spark plug job....

 

Yeah, wasn't thrilled about it, but the local stealership was more. They quoted me $315 to change them out... after a $90 "diagnostic fee" in which they couldn't accurately diagnose the problem and instead just made their best guess.

 

I heard about the $300+ price tag and said:"No f***ing way!!" I did mine and it wasn't hard, just time consuming.My only issue was a plug boot that was stuck to a plug.I finally got it though and the copper plugs were very cheap.

 

Starting a new thread to address this topic. Check it out to weigh in if you have insight.

 

Issue has been addressed to death. No need for a new thread!!!!! Do a search!!!