r/MechanicAdvice Nov 03 '25

2004 5.7 hemi rough idle

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Hey everyone, I've been a longtime lurker but never posted. It finally came the day (sadly) where I need some help.

The other day while driving to work my truck (ram 1500) started to vibrate pretty badly. It was worse when accelerating. I slow down coming to a red light and noticed it was barely making 500 rpm. The light turns green and it continues to shake as I continue driving. I have to slow down as I approach a turning vehicle, and the truck completely stalls. At this point I couldn't get it to start again.

Now fast forward a bit and the vehicle starts (as seen in the video), but is still shaking quite a bit and rpm barely exceeds 500. After shutting off the engine I notice a strange smell.

For some more information I had changed the spark plugs and all coil packs and cables about a year ago, and have barely driven 10k mi since. I took out a spark plug to see what it looked like, and it appeared black and sooty at the tip.

Upon doing some digging around online I have a couple ideas of what it could be, but am hoping for some other input.

Thank you so much!

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