I would have to say it is bad gas. You choose premium but what did the person before you choose? The way they have the pumps set up today there is always a hose full of fuel left from the previous user because the hand control is designed to shutoff when a drop in pressure is sensed. This also assumes the pump wasn't malfunctioning and although you picked Premium it pumped a different grade of fuel.
Bad gas? If it had a little water in it, it should clear up shortly. Might try a bottle or two of HEET-isopropyl alcohol-to remove more water, if any.
If problem persists, I would have that knocking checked out.
Good luck.
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