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the car feels like it is draging when you drive it, there was a popping noise and you have to hit the gas hard to back up.
I think you have a rear brake problem like something's come apart back there. Tow the car to a Ford specialist for diagnosis and an estimate.
Here's a directory link for you:
Common Problems > Ford Focus
Q&A > Ford > 2002 Ford Focus
Q&A > Ford > 2000 Ford Focus