When 1 cylinder is misfiring, most of the time it is just a bad spark plug wire. Replace your spark plug wires and the problem should be fixed. If not, replace your spark plugs, but usually it is just the wires that need replacing.
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Do a complete tune up.. Spark plugs, wires, distributor cap, and rotor button... If it has coil packs that sit on top of the spark plugs.. Replace the spark plugs and cylinder number one coil
SOURCE: misfire on number 5 cylender
Youm either have a fouled sparkplug [ should be changed @ 100,000miles ], a bad igntion coil on that cylinder or a faulty fuel injector. Most likely = a bad coil.
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