Hello once I had a problem with a Cirrus 2.5 and the problem was what I imagine turned out to be that this car was removed from catalysts and all the carbon dioxide like Tizne arrived the oxygen sensors what Ise was removed clean them well washing them with carbuclean and re -install if it improves but does not fix the problem you have to change the oxygen checlo 2.4 The catalyst was taken away from the oxygen sensor ... !!!