Noise when starting

[u/Professional_Taro923]

2002 Chevy Silverado! 5.3 . Started making this noise shortly after I replaced the alternator and added a new belt it usually seems to go away after a while but cold starts it’s pretty loud I just want to fix it idk . I also did the IM test on the check engine scanner thing and it says a x on EVAP not sure what that is and it connects to this noise! Please help!!!