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Light engine surging while between 40 to 55 mph


New member
Buick Ownership
Wondering if anybody has had the following problem. My 2012 Buick Uncle has a 140000 miles on a serviced religiously but recently has begun has begun surging very slightly, But noticeable. The surging I described as a slight speeding up And then release speed up release and this continues as long as I remain holding the pedal at that position within the speed of around 40 to 55 miles per hour. Anything faster than that it disappears anything lower than that it's not noticeable . The spark plugs were changed at 80000 miles. Have cleaned the throttle body, air flow sensor. No engine codes or misses. It's annoying when it's happening. Any ideas?
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