Diagnosing / dealership support of autocross issues?

[Banannie]

Posting here as I hope someone who's taken their Type R on track / autocross has had good luck with a dealership diagnosing and fixing intermittent issues that are more likely to pop up when the cars are driven hard...

My car is hesitating under load, but for the most part isn't throwing codes. The codes it has thrown for this are P0191 and P0087, both fueling related.

Has anyone successfully had dealership / warranty fix of similar issues and care to share if there were any magic words that helped?

Thanks!

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