I would definately recommend a tune up. With GM vehicles I have worked on with issues of poor performance and fuel mileage occur usually around 60k. If this is your case a couple hundred bucks in parts and a Saturday may get some much needed kick back in your truck. Start with a new fuel filter and a set of spark plugs and wires. Also get some fuel injector cleaner and send it through the tank. This is also a great time to check your belts and fluid levels. When you change the the plugs note any severe wear on the ends of the spark plug. Here are a few pics to help with spark plug diagnosis. Keep in mind abnormal spark plug wear can cause interesting issues with misfiring, even intermitent one's.
Tuesday, January 13th, 2009 AT 11:36 PM