Spark plug Motorcraft or AC DELCO

AC DELCO Spark plug

While I had the coils out, I replaced the plugs (used ACDelco double platinum professional grade, proper gap. No NGKs were available). After I replaced the coils, the misfire code(s) went away for a few days.

Pros: misfire codes went away
Cons: misfire codes returned
Mileage: 40000 km
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