If my memory is still working I believe you have a Z06 in the garage. You might think about taking the coils from it and trying them on the C5. At least this would give you something to do and perhaps a lot of the bugs you have now with the C5 will disappear. In which case you will know if the coils are causing the rough idle and stumble. If that works then you won't be running around in circles with other stuff. What the heck you can then sit around knowing the real fix is on it's way.
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