I am new to the nissan forums and I am hopeing you can give me some advice. I am actually writing on behalf of my sister who has a 2004 Altima 4cyl (2.5?). I am trying to figure out why her car will just shut off while she is driving. This will happen several times in a row, then won't happen again for a few days. I wanted to see if there are any commonly known issues that would cause this. I am thinking a sensor of some sort, maybe a CPS (crankshaft position sensor)? Thank you for any help you can give me.