I have a 2016 CLA250, about 12K miles currently, purchased almost 1 year ago - was a loaner at my local MB dealership, clean title. I’ve always noticed it jerks forward and feels like it’s shifting gears funny at times, and thought it may be a normal MB thing due to having many gears (I'm a 1st time MB owner). Had the starter battery replaced since Eco start/stop never worked (don't think this issue is related). Real issue: last time I took it on a road trip, fueled up mid trip and got back on the turnpike, engine misfired (felt like gears didn't shift properly) and CEL came on. I turned the car off/on then it was fine (CEL disappeared). Happened again after fueling up back home, did the same exercise, CEL disappeared. Took it to my dealer and couldn’t reproduce issue, no stored code. Drove fine in town for a few months. Took it back on road trip today, fueled up, same issue, CEL didn’t go off after restarting. Drove rough, car was vibrating badly upon acceleration and accelerated slowly (limp mode? I did get it up to 70). Felt like I was driving on a rough dirt road. Funny smell outside the car when I got out. CEL code is misfire on cylinder 1 - code P030185. Its currently at a dealership in a different state and they gave me a loaner. Things I checked - gas cap on secure, and I did pump with Premium gas - I also tried Quick Trip and Kum and Go gas and same thing happened when travelling to see if was a 'bad gas' thing, but I don't think it is. Do I have a lemon? Any suggestions?