You have the formula of air, fuel, and spark in a motor. If you are lacking one of those factors it will affect your performance. When was the last time you changed your spark plugs and wires? How about your air filter? Have you replaced your fuel filter? All these are factors of your engines performance.
I would suggest bringing your vehicle to a technician that can run a couple of tests to find out what the problem is. Ask Patty has a list of female friendly and reliable establishments that you can bring your vehicle to.
〉 Answered on Dec 28th, 2007 by Suzanne Grego, Technician at City of Philadelphia Fleet Management