bought my car at 160k 2 months ago. The man I bought it from told me it needed an o2 censor. I've put it off due to lack of money. My car sputters & stalls when going in reverse, coming to a stop & in idle. Yesterday the rpms were higher than usual when starting, it stalled on me 3 or 4 times before finally leaving the driveway. Even once it got going it was sputtering more than usual & on the verge of stalling. I had no brakes or power steering. Drove it about 5miles before deciding to pull over...well involuntarily coasting off the road really. Replaced front o2 censor & did not fix the problem. Could this be the second o2 censor needs replacement or is it something more? I guess this problem has been building over time but the night before my car was fine & then very first thing in the morning this happens. I cant spend very much more money fixing what isn't causing the problem. Help please?