The colder it gets the greater the possabiltiy of surging as colder air is denser and has more O2 in it creating an even leaner mixture. So if it worked good on a colder day the answer would be no. On a warmer day, maybe. I would bet what ever was restricting fuel flow in the carb was cleaned out by your premium gasoline. Did you check the gaskets were in good shape and placed properly on the intake. All is tight?