Code P0308

[Sinister 2017 GT]

Hello I have a P0308 code that has popped up for a few weeks now. Also have a bad tick coming through the exhaust. I’ve replaced spark plugs, checked coil packs, checked injectors, checked the intake for stuck or broken valve rail, checked for broken or worn wires and I did a compression test. All have come back okay… yet the car is still throwing the same code. I’m lost as what it could be and what to do next.
I was hoping it was the intake. I’ve already had to replace it once for a broken shaft on the drivers side. I have a ported 2018 intake and a JLT CAI to install and have it tuned, but can’t do this until I figure out the misfire. (installed headers and a new exhaust about a month ago)

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[MiamiGT350]

Does the DTC follow the spark plug or coil if you move them to another cylinder? You can at least rule those out by swapping, which you didn't mention.

Also, have you tried a crank relearn procedure in ForSCAN? It won't hurt anything and might clear the issue.

 

[Sinister 2017 GT]

That’s how I checked the plugs, coil packs, and injectors. Code stays at cylinder 8. Performed a crank relearn as well. Just had to replace the clutch two weeks ago.

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