Normal if they have been in service along time if one goes out the all go out .so if you plan to change one you should change all of them at one time .this would also cause a problem if you only change one and not all.new one will work better than the old ones and then they would fail as well .so you can get a set of coil packs at a lot better price than buying the by them self fyi.
Any codes?
On just one specific cylinder or multiple cylinders ?
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