I bought some bad gas and now I have a bad miss. Is there a quick fix short of draining the tank and buying new gas?

If you really think so - use Isopropyl dry gas, and a product I like best called "Sea Foam" or a strong full bottle of fuel injector cleaner. If this doesn't help you may want to get that gas out! You may also have a fouled spark plug, or injector which the fuel filter should protect. Replace the fuel filter after this if it works and do that anyway soon. Good luck. If you need more help hit back,
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Tom Greenleaf - MetroWest, Boston