i have a 2003 gtp. lights on abs,trac off,cel. tired of car.how fast is this to a 5.0 mustang?tired of putting money and no results. now needs cv joints. rich fuel code after bad injector,replaced hub it seems to many sensors on this car.awesome 4 door but seems like a money pit. how much is it worth as is? 1st pontiac ived ever owned.