I have a 2015 yukon xl with the 6.2. It started misfiring on 8 and so far I have done the following.
1. New Plugs
2. New Plug Wires
3. New Injectors
Still, the misfire is there. I get the P0300 and then the P0308 code and I am at a loss as to what to try next.
Oh and I swapped the coil out...
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