New problem. I own a 2010 Chev Malibu. 4 cyl. 9900 miles. No codes so the dealer said they can't help. Surging around 1900to 2400 RPM. More noticeable with AIR on. When I get beyond 2600 RPM. you can feel the car go past that area and run great. One time yeste... Login to read more.