ok replaced the fuel filter today and still is running the same also put fuel system cleaner in it so far it has had no effect the car still is running bad im thinking about breaking down and buying the o2 sensor but dont want to if it aint broke as i am running out of money very rapidly when i disconnect the wires from the sensor the car maintains a rpm of around 2000 and runs good does this mean the sensor is good or bad?could there be a problem with the fuel distribution thingy?im still at a loss and hope i find out whats wrong soon thanks for your help