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Q: what does codes P300,P301,p302,p306 mean and where do i start on problem on 2001 Toyota Avalon

changed spark plugs and running great until I stopped and got gas a little later it started misssing and cel started flashing. running so rough thought i was having a flat tire.
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Re-check all the coil/plug connections and IF it wasn't running like that before getting the fuel, take a fuel sample to be sure there's no contamination , although if it was bad gas , it should have all cyl. misfire..... AND follow #1 advice.
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