2004, 5.7 misfire

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sleeprtsi

Junior Member
Joined
Jul 3, 2020
Posts
7
Reaction score
0
Location
New York
Ram Year
2001-1500, 2004-2500
Engine
Magnum 5.9, Hemi 5.7
Need some help to get my plow truck running:
I've had the truck for about 5 years and really only use it for plowing (less then 400 miles a year). It's had a down stream o2 sensor code since before I bought it.
There's been a misfire that comes and goes: it's got bad valve seals so I assumed it just needed to burn the oil off the plugs. Past couple times I've driven it to get heat in it the misfire has stuck around. So I started changing plugs, and they all looked good but the coils were swollen: so I replaced all the coils. Misfire is still present and pretty bad: like won't idle bad.
It was almost out of fuel so I put 3/4 tank of ethanol free in and drove about 16 miles, no difference.

Hooked the scanner up and active faults are: p0113, p0131, p0300, p0551 and u0155 (network?). Pending codes are p0038, p0058, p0562 and p0700. I did have to jump it after sitting for a month but it's started every few days since and charging voltage is 14.3.

Where do I start looking here?
 
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