I have a 2003 nissan slAtima 3.5 v6 it would loose powerr even after I drive it for couple days it would start with a jump. I cleaned the mass fuel sensor and try to start it but it wouldn't start. It wanted to but didn't.my friend put a of try reader on it it ame back the 02 sensor. Can someone help me out on what I can do.im a women that don't know much. Thank you