u/AlmostTopSun

I've noticed recently that my car has a pretty rough cold idle that fully goes away once warmed up. No warning light, no check engine light, and when she's fully warmed up, It feels slightly sluggish compared to a couple months ago. could it be low quality fuel? I get my fuel from a small town, (e87 per usual, 91 premium if I feel like giving my car a treat, and yes, according to the manual, my corolla can take all but diesel) but not the mom and pop gas station. I know it could be numerous other things like ancient spark plugs or ignition coils.