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GM 3.6 with 97K would be absolutely 100% spark plugs. I would also change the Coil on that suspected cylinder. Most 3.6 Engines will only miss with a bad coil under load or when introduced to certain weather conditions.
I sent you over a PM to help you out.
Anyone else with 3.6 Issues, Please feel free to reach out to us at GM Parts House. My name is Chris and I know the 3.6 Inside and Out. We are a New Car GM Dealer and have access to any information that can help our customer's out.
Thank You!
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