My 2005 Ram 1500 4.7 is throwing various coil pack error codes at various times, never more than one at a time. It has jumped from cylinder 1 to 3 to 4 to 6 in that order. Also I'm getting too lean codes on O2 updraft sensors, but never consistently or at the same time. The engine never runs rough or demonstrates typical symptoms of a miss. Fuel consumption never changes either. I'm beginning to think there might be a grounding issue which is causing the error codes to jump around from one component to the next. Any thoughts on the matter would be appreciated!

 

Have you tried clearing the codes to see if they return?

When was the last time(if ever) were the coil packs changed?