Timing/Octane question

[Stu_486Fitter]

Not expecting tunes to fix. At WOT with 87 octane the motor would break up a lil bit and the CEL would flash as if it was a miss but wouldnt record a fault. Was suggested to me to use a higher quality fuel with a higher octane, and it runs beautifully now. Note: that was happening AND was cleared up before the tuner was ever in play. Now I always run 93 and want tuner adjusted accordingly untill i receive my custom tunes.