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Spray some carb cleaner in the air bleeds of the carburetor. Could also be fuel filter.
Generally you can differentiate between fuel and electrical.
Fuel will cause the car to gently "nose" over, electrical will cause an abrupt or intermittent shutdown, causing the loss of spark to the plugs. Think it through.
I think it is too soon for formulation changes of fuel at the pumps, it has to get colder, even in Utah.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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