I recently bought a 1995 aurora. the car ran fine when cold, but after warming up when you put the car into reverse and then drive it is really sluggish. you have to have the accelerator to the floor for it to get up to speed. when you shut the car off and turn it back on again it performs just fine. I have replaced the spark plugs the catalytic convertor and the fuel filter and nothing has relieved the issue. before I replaced the CAT convertor it would hardly move after that it performed better. can anyone help me out?