Had this same thing happen to my 2014 5.3 LT Z71 with less than 37k miles on it. Happened to me yesterday. CEL Flashing with the Stabiltrak light solid. Start ticking even while pressing the gas. Rough idle and just running and sounding like dog crap! Called and scheduled a service appointment on it today for tomorrow at 7am. My code reader just showed P0300. Will update on what I find out over the next few days. Really disappointing tho. Almost want to just fix it and then sell it!!!