2002 Camry randomly stalls immediately after start up

What is your question?

At times I have noticed, pretty much on warm and humid days the most, that my 2002 Camry would die immediately after it turns over. Sometimes it would idle so low at start up that it threatens to stall, then goes back to normal idle. I looked it up in the past and I got the idea that it may be the PCV valve. I changed that along with new spark plugs and I still notice it doing it. It does this several times in a row until I hold the key at ignition about a second after it starts, and then it stays running. What else could be going wrong?