cold start problem

i have a 2010 aveo LT and when i first start it when its cold it sputters and dies if i let it. i have to rev it up a few times to get it to smooth out then its fine. i have replaced multiple parts nto try and figure out this problem but it keeps happening. this problem has become extremely frustrating and i need some help. the car does not throw any codes just recently replaced the air filter and mass air flow sensor, new plugs and coil pack. replaced fuel pump and themostat housing and both temp sensors PLEASE HELP!!!!!!!!!!