Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
With all of the odd behaviour with the coil and wire swaps, I decided to throw both at it. Swapped all of the coils (and the remaining wires) from my 2008 Suburban onto the 2007 Avalanche, and it's been running perfectly fine since.
Ordered some used coils off ebay for the Suburban, and new wires as well, and all is fine.
I can see ONE coil or wire being bad, but not multiple. Very strange.
