My car keeps shutting off

I had the same problem with my '02 Altima the other year - it would suddenly shut off at low rpm and in rainy weather. Turns out the crank shaft sensors are bad, and Nissan has a recall out for the sensors. I ended up paying $75 ($25 at a shop to tell me the problem, and $50 at Nissan to replace them from a previous recall) to have them replaced, and a couple months later I received a notice about a second recall on the crank shaft sensors. See your Nissan dealer and verify that your Altima has had the recall performed. If it has, the sensors should still be under warrantee. If not, have them preform the recall. I still have not had the recall performed since I had mine were replaced a little while ago. Hopefully this will fix your problem.

I've got a 02 also and had no problems starting it, then one day I go out to start it and nothing happens. Thought it was the battery but no. Had it towed to dealership and the negative battery cable going to the chassie was busted and thats like 6AWG wire go figure how that just busted. But that could be same with yours.

Could be cam sensor fault or just even ecu may need remapping