I have a 2014 chevy cruze 1.4 LT with 44000 and only 8000 miles on the head. Just had the pcv and valve cover changed. I drove the car today engine ran rough. Service stabilitrak and traction control message came on then service engine light started flashing p-0303. Ive had alot of issues with this car this is just the lastest 1. Any advice would be great. It seems like I keep chasing gremlins with this car.