Hi. My 2015 Chevy Malibu Ltz Turbo 2.0 has a very bad stuttering, jerking, fit throwing when I accelerate, most of the time right at 40 mph, hill or level. NO engine lights, and otherwise motor and transmission are smooth as silk, 32 mpg. It runs and shifts perfectly in the manual mode. It still stutters though at 40 miles per hour. It has recently become worse after going to yet another mechanic guessing at what's wrong. This is its fourth set of coil packs because that's what they insist is wrong with it. Please help me. Recently went through a nasty unwanted divorce and my ex was so good at figuring these things out. I cannot trust anymore and they have taken all my money to not fix my car. It's an absolute dream to drive except for this one flaw. There's not much available on the internet about this problem and the dealerships make me want to scream.