Stalling Problems-'96 Concorde
 

Im having problems finding out why I am stalling. Usually it happens as I am sitting at a red light, when backing up or even once while I was turning and ended up hitting a curb. I know that I need a new o2 sensor but I really need to find out exactly what is wrong because I plan on giving it to my brother when I buy a new car.

Thank you in advance.