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2012 Acadia Engine Lunges

m_olneym_olney Posts: 3
edited July 4 in GMC
Hello!
New to the forums and searching for answers to my current GMC Acadia problem.
Recently, I’ve noticed that if I keep my RPMs at about 1,500; it will gently “bounce” anywhere between 1,200-1,800 RPMs and the car’s speed will “surge” like a wave. This isn’t a hard shift but a rather gentle one. I don’t get a check engine light or code warning. I’ve taken it to Auto Zone and their free error check found nothing. But, the service tech said it sounds like a transmission shift solenoid issue.
Has anyone had similar issues? Has their been any solutions identified? Thank you all in advance.
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