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A seemingly basic diagnosis turns into a neat little case study :)
This low-mileage clean 2004 Chevy Avalanche V8 is running a lot worse than it should, at times misfiring on up to 4 of 8 cylinders.
In Part 1 I show the codes and preliminary data. Who can guess what the problem is before we finish the diagnosis in Part 2?
Enjoy!
Ivan