Maxima 2000 stalls on start up?

1. Loose or faulty electrical connections at coil or alternator
2. Insufficient fuel reaching the fuel injectors
3. Vacuum leak at the gasket between the intake manifold/plenum and throttle body
4. Idle speed incorrect
5. Intake air leaks,broken vacuum lines

Or try.....

If there are check engine light codes, take it to AutoZone for a free analysis.

If there are no check engine codes, the main suspect is the Mass Air Flow (MAF) sensor. Go to AutoZone, buy CRC brand MAF cleaner in a gray spraycan. Remove the MAF connector. Remove the MAF. Do not touch the internal parts of the MAF with anything! This is important, no brushes, no fingers, nothing (if you touch it, you break it). So with MAF out, you'll see a silver area or a thin wire. Spray well, then let dry for about 2 hours or so (let dry really well). reassemble everything. Start up and stalling should not happen anymore.

So, if the MAF cleaning does not solve it. You might try removing and cleaning the IACV.

Sometimes cold stalling can be caused by a vacuum leak. Take a really close look at any hoses that may be cracked and leaking air. I once found a pin size hole which kept causing my engine to stall, I cut the end with the pin hole off, reattached the hose and all was well.

Good luck, reply back whether the advice worked or not.

Read more: Why_does_your_Nissan_Maxima_stall_when_cold_but_fine_when_warmed_up