2015 qx60 miss?

Hey all, I recently bought a 2015 qx60 for 6400 bucks. Has a rebuilt title for a sideswipe on the driver rear. My question is, sometimes when starting it, it’ll miss for a few seconds, then runs fine. Sometimes it’ll even die and I’ll have to restart it and it’ll run fine. Car runs out great, only sometimes on start up. Also, when under a quarter tank of fuel, it’ll just stutter on the road pretty bad, like you can press the gas and it’ll do nothing and all of a sudden, it’ll kick in. Getting lean codes, 02 sensor codes, air flow codes, as well as a c342d code. Maybe I should put a fuel pump in? Thanks for any help.