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It would be helpful to include such information as what engine, how many miles on it, stuff like that.
What is happening to the plugs? I'm not sure what you mean by blown plugs. The more info you supply, the more help you'll get!
Coil -over- plug equipped engine? Keep track of where you move the coil to and see if misfire follows the coil . Had his same thing happen to me. $900 later it was fixed with a $100 coil.