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It can be very simple, or very complex. It could be a coilpack, bad plug wire, or even a bad spark plug. But it could be as serious and a cracked cylinder. First change your plugs and wires, if that doesnt fix it change the coilpack or check your distributor, whichever you have. If that doesnt do anything you will need to have the engine top end torn down and looked at

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Q: Your car was scanned an it read that cylinder 4 misfire what to do about that?
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