Honestly, I'd cut my losses and help them find a new car. No offense to your parents, but the PT Cruisers weren't exactly high quality cars to begin with, and getting a new engine put in is going to cost you roughly about what the car is worth. If there was a guarantee that nothing else was going to go wrong with the car, it would be one thing, but considering things can, and being a PT Cruiser, probably WILL go wrong with it, I don't feel it would be worth it. The only way it would be cost effective would be if you can find a backyard mechanic to drop a known good used motor in it, but even then, given the circumstances (where the car is right now, trying to find someone trustworthy to do the labor, trying to find a trustworthy person/place to get the used motor from, being hundreds of miles away from where the engine was bought, thus making any warranty offered worthless, etc), I don't think it's feasible to go that route.