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Transmission Issues (Please Help)

4535 Views 2 Replies 3 Participants Last post by  Crazy8
I have a 2008 G8 GT with 53K miles. Recently my RPM's have been fluctuating up and down as I drive a constant speed in the 40-45 mph range. You can feel the car surge back and forth as if the transmission was slipping. Has anyone have any of these issues and if so what was diagnostics? Any help would be great.
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