Ok, there can be many reasons for a cylinder miss fire. Do you have the engine code for the misfire? If so post it. If not go by your local auto parts store and ask them to pull codes for you and write them down and post.
The cause is typically a vacuum leak in the intake manifold, throttle body or vacuum plumbing, a defective Exhaust Gas Recirculation (EGR) valve that is leaking exhaust into the intake manifold, or even bad gasoline. Less common causes include bad spark plug wires, worn or fouled spark plugs, a weak ignition coil, dirty fuel injectors, low fuel pressure, or weak valve springs. If a misfire is occurring in only one or two cylinders, you will usually find a misfire code for that specific cylinder rather than a random misfire code.
Saturday, April 30th, 2011 AT 6:44 PM