I would just go fill it with premium and keep your foot out of it. The regular gas isn't going ti hurt you if you drive it nicely but you need it in there when your foot gets itchy. Like billboost said, change those plugs out as well. And maybe go over your vacuum lines. Kind of a long shot but maybe you have a leak when the blower starts building pressure somewhere. There is no security light in correct? Maybe the belt breaking and the alt bot gettingthe power set the security light?
Just throwing out ideas here
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