2008 Kia Carniaval

I brought this car about 3 weeks ago off a guy in Ourimbah after checking it out I asked him any problems that I need to know about and he said only needs spark plugs changed it was running a Lil bit rough .Upon getting a engine diagnosis after purchase I was told it has a oil leak ,cylinder 3 missfire ,mass airflow sensor need to be replaced i More

A$1,900