Ah. Good. I thought you meant the wiring into or out of the coil was literally fried, as from over current or electrical short.
You're already on the right track with this knowledge! On this note, some may post up info or suggestions that you're already aware of, especially in dealing with well-known problems. It's not presuming you have a lack of knowledge or skill, it's being thorough. My point in asking is that the market is flooded with counterfeit AC Delco parts, and they're sold on our beloved Amazon (Not bashing Amazon- they're just a marketplace). You had ignition-related problems which seemed to have been resolved with new plugs, but they soon returned as if the new part(s) were failing already. I just wanted to make sure you were aware of the fakes and, if there's any suspicion, get 'em out ASAP before they could cause mechanical damage. Start simple and make sure the wires are all fully snapped onto the plugs. The chances of having multiple wires loose, resulting in a random misfire code are slim. So it's more likely higher up the chain.
#7 having the excess buildup is a common symptom of the oil consumption problem these engines are known for. Do you keep tabs on your oil level between oil changes? Disabling AFM would be a wise start and adding a catch can is a must. I'd also advise that you determine if yours has the updated driver side valve cover. I think this was implemented in 2010, so yours may or may not have it. It's a worthwhile upgrade. Here's this if you haven't read up on it:
https://static.nhtsa.gov/odi/tsbs/2012/SB-10062524-7690.pdf. Another member,
@donjetman (This is twice in two days I've tagged you, Don- I hope you don't mind!) completely reversed his engine's oil consumption by following this TSB, and he substituted a cheaper and more readily available cleaner. If I could find his thread, I'd link you to it.
