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Originally Posted by bcredliner
Seems the best that swapping all ignition components side to side is move the issue to the other bank? Why not just disconnect current to one cylinder at a time and see if one or more cylinders change the rough idle the least?
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I have disconnected, one by one, the coil plugs on bank 2 and with each one there was no noticeable change in running. I disconnected all 4 coils on bank 2 so it is only running on 4 cylinders and that is how it has been running all along. I put a spark plug in one of the coils and it does have spark. So it appears that the fuel injectors are not firing on any of the bank 2 cylinders.
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Swapping all ingition from one bank to another will help
clearly distinguish between an ignition and fueling issue on bank 2.
He may have an O2 sensor problem but the truck will not run like crap even if
every O2 sensor has failed. It will just be in a less efficient open loop fueling map.
edit: Also, where are the misfire codes?