My experience tells me that GP's may fail intermittently, meaning you cna ohm them out, but after they start to heat up they open. My car went through a period where she ate GP's. I replaced the one's I had with store bought Motor craft GP's which really suck. Thank God the Ford plugs have a 2 year warranty. I also believe that when a GP fails, the others are stressed more (higher voltage due to the remaining GP's which shortens their lives)

Replace the one that's burned out to buy you time. Then replace all of them , saving the old ones for a cold rainy day.

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Closing the store
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