My name is Dave and my fiancé owns a 2012 Chevy Cruz. She has had it for 10 months and has been nothing but problems for the last six. I need some insight on code p0303. I have a misfire on cylinder three and having trouble finding out what’s causing it. I just change the spark plugs so it shouldn’t be that. I’ve tried adding fuel injector/system cleaner and it helps for a day or so but then goes back to running rough. My girl Stepdad said to try spraying carb cleaner on the intake while it’s running to see if it makes it run smoother because he thought there was a crack or leak in the intake but that didn’t work. I’m thinking it might just be a bad injector sense the fuel cleaner seems to work for a day or so. Should I try a new injectors or does anyone have any insight?