My son bought a new 2019 Silverado 4wd, and loves the truck..he came to me in August and complained about poor fuel mileage,rough idle, shutter....no codes, still under warranty...took it to local Chev. dealer and they diagnosed a bad torque converter. that was 12 weeks ago! he has a loaner (Toyota corolla), but its snowing and its deer season...He was very patient but thats running thin!! We spoke to service dept, sales ect...that's about a waste of time!...Covid,supply chain, ect ect...Has anyone here seen anything like this ???...My truck is a 2018 with 28,000...they told me to get the fluid changed soon....do they know something here? any suggestions?