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Surging problems


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2012 GMC Yukon 5.3l, driving at a steady 45 to 55mph. The rpm surge up and down. You can feel it while you drive. Its like it speeds up for a split second then slows down. There are no codes. The engine is brand new crate engine. I have noticed the afm switching from V4 to v8 during this event. Anyone run into this issue before?

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