There’s Something About Paulie is episode 16 of family guy season 02. It was originally aired on June 27, 2000.

When Peter buys a car for Lois from an unscrupulous salesmen against her advice, it turns out to be a lemon.  While drowning his sorrows at a local bar, Peter meets a mobster who helps him out with the car situation.  In return, Peter fulfills a favor and takes the mobster’s nephew, Big Fat Paulie, to the movies.  When the two hit it off, Lois becomes concerned with their ties to the mob and Peter inadvertently puts a hit out on her when she forbids Peter to see Paulie.