katlady, Welcome to the Forum.
You didn't give us much info to go on such as mileage, NA or Turbo, year etc.
My first thought would be plugs and wires, I changed mine before I had 500 miles on it as the stock wires are crap. There is "sticky" on how to change them. Good Luck and let us know how it went and if it helped.
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2008 Silver Steel Metallic, Touring, NA, Sirius; Chromed door handles; lower grille; fog light surrounds; chrome front & rear bumpers strips; Airaid air filter; Bassani duals; Modesty Cover; Autolite AP5263 Platinum Plugs (.040); Crane Plug Wires; NAPA Ceramic pads; Blane hood struts; PTeazer Gas, Brake & Foot Rest Pedals, '05 Rear Step Pad, Stainless Door Sills, Llumar tint, "A" Piller chrome; APC Strut Bar