My engine shuts off when im in park and i have my car running with my a.c. on

Hard to say but you can start with scanning the computer for codes especially if you have a check engine light on. A tech will need to duplicate the issue but you can try and hook up a fuel pressure gauge to start. Hook it up and try and duplicate the engine dying out. See if the fuel pressure drops before it dies out. If you don't work on your own cars, then use this link to find a good shop near you. https://repairpal.com/repair-shops Alex Alex