Gunshot Sound- 

https://freesound.org/people/Bird_man/sounds/275151/

Zombie Groan- 

https://freesound.org/people/Breviceps/sounds/445983/

Engine Idle noise-

https://freesound.org/people/bikesnbassboi/sounds/540398/

Mouse Sound- 

https://freesound.org/people/uwesoundboiz/sounds/109831/

Heartbeat- 

https://freesound.org/people/loudernoises/sounds/332806/

Wheezing-

https://freesound.org/people/calmingcrunch/sounds/514794/

Bottle Sound-

https://freesound.org/people/iwanPlays/sounds/532749/

Car Start - 

https://freesound.org/people/GiocoSound/sounds/401554/

Many Other Sounds used form RPGMaker VX Ace sound library