Surging problems

By Christopher Marrero
January 1, 2020 in Gen III & Gen IV V8 Engines (LS-Based)

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Christopher Marrero

Posted January 1, 2020

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?

riverbanks

Posted January 1, 2020

Everybody is at the bar, might have to wait for a response

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