You are NOT dumb!! Auto mechanics might not be your specality but every day is a oppertunity to learn something new. I have very little hands on experience with EFI but have bought a pesonal library of text books off Amazon. It may be a morbid sense of curiosity.
Trouble shooting auto mechanics is a art. Think it through , start with the simplist or cheapest possible fault and work it forward. Some systems have known weakness and it doesn't hurt to know your enemy. Youtube is not a bad resource , you just have to recognize BS when you hear it.
The injector cleaner and a Italian tune up is not a bad idea. ( drive like it is stolen) I doubt any Pantera owners drive like old ladies , the Pantera has long legs.