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inconsistent power

  1. Inconsistent Power?

    2005-2010 Mustang GT Tech
    Help me out guys, my car seem's to run strong one day and the total opposite the next day, it makes like a hissing sound when I push it hard but doesn't respond like it normally would. Is it an exhaust leak? bad Cats? Spark plugs? Any other ideas what the problem could be?
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