Yeah, you need to use this tool called a fogger it will help you to find your vacuum leak if you’re not careful you could even throw the thing into safe mode all over a vacuum leak that’s one thing about the new Chevy things you get a vacuum light vacuum leak or problem with your EGR etc etc you can throw the thing into safe mode you could try a hard reset disconnect both battery cables for about 30 minutes and then make sure you put the positive on first and then apply the negative.