Sr20det falls on its face after idling 20 sec

[Sr20-Vert]

Hi I got a Sr20det 850 denso gtx3076 greedy intake manifold R8 coil packs aeromotive fpr set to 45 but tuned at that level running haltech using there on board map car mad just under 500 whp on 93 when it idles for like 15 secs it idles around 12.8 13 afr runs perfect even changed the plugs what happens basically all of a sudden afr goes to 10 and it stalls don’t think it’s boost leak cause car will run with no piping at all because it’s map and not maf can’t figure it out it’s driving me crazy I changed coolant tent sensor also I never really checked if motor was in time with timing gun just set cas right in middle but it was idling fine for a month now it falls on it’s ass after 20 secs or so runs fine while driving makes same boost 21 pounds showing on my blitz edc screen and on boost gauge