Before I get flamed saying I haven’t searched and all the other typical forum drama crap, I have searched for this identical issue and nothing has came about exactly like my issue. First off car is a 2004 NSRT 80,000 miles with stock turbo with AGP waste gate, AGP CAI, AGP intercooler, AGP hardpipe with HKS SSQV BOV, AGP catchcan, Diablo intune 93 tune, and stock everything else. Had a hanging idle at 1500-2k when rolling to a stop (text book vacuum leak), ended up being a bad diaphragm in the IAC. Replaced the IAC with a brand new OEM one from Modern Performance. After replacing it I realized that the wire loom upgrade done by the previous owner wasn’t soldered or crimped with any type of connector. The wires looked like a rats nest and since I didn’t have time to restrip and solder the wires back I just cut the connector off to do later. Without the plug connected the car ran great once the engine was up to temp. Throttle response was amazing, RPM fall during decel was great as well. Fast forward a week when I had time to fix the wiring and now the car is right back to a hanging idle. Verified no boost leak and verified no vacuum leak... any ideas?