Mine ended up being the aftermarket upstream O2 sensor. One i installed an ac dellco all was well. I did a bunch of work before that but that was the straw that broke it. You can check my previous posts for the list of other work i did.
I was wondering if you found a solution as well. I have replaced a bad injector, replaced both vvt valves, both fuel pressure sensors and intake gaskets and still have this exact problem.
So I saw on one of these threads that the Bosch 02 sensors could be a problem. As I had put one of these on I decided to take a chance and replace it with the AC Delco OEM part. Low and behold my problem is gone. Two days now it has started up without stalling. Hoping that my problems are over for a while.
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