unfortunately its a as is deal when you buy a used car. Never listen to the owner, always take a car to a mechanic, especially if you do not know much about cars. This question gets asked a lot, I wish there were better news, but the reality, is take it to a mechanic before you buy. That is the only way. I know right now this is not what you want to hear, but here is a website that can help you when going to buy a used car, it will help you learn what to look for, what to look out for, and there is also a section on used car reviews, I recommend doing a cold start test drive on any car, after sitting overnight, start it up and see what it sounds like and runs like when cold, and take it for an extended test drive, at least 40 minutes, had you taken these simple steps and then taken that car to the mechanic, this may not have happened. These kinds of lessons really suck, but at this point if the rest of the car is decent and the tranny is still good, it is possible to find good used engines, talk to your mechanic, sometimes mechanics have connections in a wrecking yard, that can get good reliable engines, so dont despair, never give up, when life hands you lemons, make lemon aid, get it running and drive by the dummies house who sold it, hang in there make lemonaid.