I had a misfire and bought these coils to try and fix the problem before taking them to the dealer. I replaced the coils and continued to misfire. The misfires actually got worse after about a week. I took it to the Chevy dealer, they ran a diagnostic and found misfire on 3 cylinders. They checked the wiring and found that the coils were getting the correct signal and weren't firing. 3 out of 8 coils were NOT BAD. Not a very good chance
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