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Update, still fighting this issue also tuner says that everything looks fine and doesn't think it's a tuning issue. I have replaced the high pressure fuel pump because when compared to the BRZ I own it holds pressure in the high pressure rail after I shut it off from a start. The FRS that has this issue would not hold pressure it would immediately start dropping. The new/used pump holds pressure after shut down, I've got 56psi on both port and DI lines running and sitting and they hold pressure for more than 15 min and don't drop. High pressure on start up is about 1800psi @ 1500rpm the when it idles down it's stays around 580psi @ 650rpm. I will say the new/used HPFP does seemed to have helped, at first I thought it was good didn't stall first time I started it but rpm did drop down to 600-700 then it caught itself and stayed running. But more I have driven it with this pump seems the worse the cold starts have gotten maybe another bad pump? I'm not sure because this one doesn't seem to have any flaws I can see in testing? Anything else I could try? Was hoping to figure this out quicker but man what a pain.
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