91 Octane

First 3 logs on 91 octane. Once I get to about half a tank I will fill up with E85. Car felt good while driving and in higher RPM. The only thing is when coming to a stop the RPMS drop to about 500 and AFRs shoot way up and then come back down. Initial startup AFR's are ~15-16. When the car warms up they stabilize to ~14-14.7

2500 - 0 3000 - 4 3500 - 4 4000 - 5 4500 - 5 5000 - 3 5500 - 3 6000 - 2 6500 - 0.5 7000 - 0.5 FB and FOL 0ed

2500 - 0 3000 - 4 3500 - 4 4000 - 5 4500 - 5 5000 - 3 5500 - 3 6000 - 2 6500 - 0.5 7000 - 0.5 FB and FOL 0ed out.

Car kept throwing a code for low boost pressure and causing reduced power.