Recently started rough idle
My 19 3.5EB (45k miles now) just recently starting idling really rough. The only thing I have done differently is started using Sheetz gas ((87 octane E10)). 87 octane and E10 is literally all I have ever used. No Check Engine light or other weirdness. The rough idle is obvious and noticeable. Anything I should check/do? Are these things *that* sensitive to fuel that changing to Sheetz gas would cause it?