Hello and thank you in advance for your advice. So I inherited my mother's 2002 V6 Automatic Ford Mustang when she passed in June and she's not in the best shape under the hood. My car not my mom lol. She has a couple of oil leaks that I need to get taken care of, the check engine light is on and brings up an evaporation/vacuum code, when idling or just sitting she has an awful smell like something is burning but doesn't smell like oil burning, and the thing that is bothering me the most is...

Help! Idling high with grotesque smell when sitting!!