The codes indicates a misfiring, not necessarily the ignition coils are not sparking. If problem occurred only after replacement of spark plugs, I would suggest rechecking the plugs because it sounds like one of the plug spark gap is completely closed.
Also check the wire harness and other connector for looseness.
All 6 coils receives power supply from the same source so there should not be any problem with that.
Please let us know if you need anything else to get the problem fixed.
Tuesday, December 14th, 2010 AT 4:55 PM