Tonight, my 2020 3.5 EB was running great UNTIL it began to shudder and the check engine light came on flashing. It was running super rough and I babied it to a car repair place with a pretty good record. They called me and told me that it had thrown codes of misfires, it was running super rich, they are unsure of the diagnosis. To open it up, eval and repair, worst case, replace 12 injectors, $4400. Nearly $3k labor. May be broken fuel rail, may be injectors, may be ignition mods. Attaching codes. Super NOT HAPPY, obviously, because my truck has 62k miles, and I am JUST outside warranty.
Anyone have any experience with a similar issue? The tech said he checked and there isn't a known issue and my buddy the mechanic said he is dying to know what they find, too.
thoughts?

 

If nothing else, at 62k you need new spark plugs. However, you do have more than that going on.