So i just picked up a 97 ej8 with a built gsr-t. Cp pistons eagle rods GE sleeves with a port and polish on the head and springs and retainers. Turbonetics t66 tomzilla tuned on 12lbs.

The problem that i am having is that once the car warms up and the IAT's get into the 160's the car will die while driving. It coasts to a stop and i have to let it sit for 5 mins before it will fire back up. It also dies when coming to a stop. Its tuned on s300 and throwing codes for IACV and VSS (speedo dies when car shuts off, not sure if its related). I know the IAC could be the reason its dying when coming to a stop out of gear, but the car dies when cruising too which im not sure is related to IAC. The tune def needs to be adjusted by i DONT thihnk its the reason the car keeps dying when its running down the road

Any help would really be appreciated.

Notes:
I have swapped the dizzy iwth a known working one with brand new internals
Not sure what wiring harness the owner installed but the wiring isn't perfect, how could i troubleshoot the harness

thanks for the help