Coils on all 6 cylinders replaced in October 2019. After 3 months (until Jan 2020) the engine light was flashing and the engine was jerking very badly and the engine code noted misfires on 1 and 6 cylinders. I removed the new coils from cylinders 1 and 6 and put the old coils back in those cylinders and the engine ran fine for a month. After 1 month the engine light came on again and the code identified a misfire in the 4th cylinder. Replaced the new coil with the old coil for 4 cylinders and everything works fine now. I expect one of the remaining coils will fail at any time, and I carry the old coils around the car just in case. All 6 original coils were working fine after 265,000 miles and I figured buying these new coils and replacing the original coils (265,000 miles) with new coils should be good for the car. But I've learned not to fix what isn't broken.
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