Title: Lasted less than 4 months
Product review: After having research spark plugs I settled on these thinking they were the best. I installed them in a 2004 Surburban 1500. Everything seemed great for the first 2-3 months then I noticed the engine was running rough. Took it into my Chevy dealer and the tech said the plugs needed to be replaced. I told him they were brand new plugs and his comment was other manufacture plugs have been causing problems and he recommended GM parts. Had the plugs replaced and haven't had an issue since.
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