Have you ever jumped the gun at a stoplight -- rolling into the intersection before the red light turns green? You might get away with it. Then again, you also risk getting a ticket.

Something similar can happen to car shoppers, too. Only the risk isn't getting caught in a moving violation -- it's getting entangled in a money violation.

It's called "yo-yo financing," and it's what happens to car buyers (particularly ones with so-so credit histories) who take possession of an automobile before their financing arrangements are complete. If their financing falls through, dealers can pressure the buyer into a revised deal with extra costs or fees -- or move to repossess the car.

The consequences of this dubious dealer practice are no fun: Either you pay more to keep the new car you thought you'd already bought -- or you lose it. It's an embarrassing, and potentially expensive, problem.

Read more at Daily Finance: http://www.dailyfinance.com/2012/05/09/yo-yo-financing-car-buying-speed-trap