I have searched back to 2003 reading about this hang. Bradness wrote about not using flathead screws during the optimzation of the TB because it could cock the plate in the bore. I do see a fair amount of light shining trough the closed TB but no more than my cleaned unmodified 54 MM one. I am pretty sure this isn't the cause of the hang. When I start the car from a cold condition the IAC seems to control the car normaly, Idle comes down to < 1000rpm. The hang only happens after you accelerate above 1500 rpm. With the throttle hang fix plug installed, it definitely helps with the rpm drop from above 3000 rpm. Should have installed this yrs. ago, also stops the moose using my original IAC, I have installed again.
I did reuse my UIM gaskets and this has me thinking to check that area.
