I had a fault code on one coil so I decided to put all eight as I have 140k miles on a GMC Sierra 1500. Now I have five (5) trouble codes and the truck is serviceable until I fix it with that many misfires. I'm not sure how I test the coils to see if they're bad, but I just ordered new spark plug wires to rule that out as a potential problem. I put in new candles a few weeks ago, so that's not it.
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