Originally Posted by
IMSHAKN
It's simple. Tell the previous owner that if he cannot produce a title then you want your money back and he can have the car back (minus the parts that you have already installed). If he doesn't want to do that then take him to court.
Never hand cash over without receiving the title right away, no if ands or buts. Next time you're in that situation, tell the seller you'll come back with the money when they have the title.