My brother put a tbss manifold on his firebird a couple days ago and I've been trying to get it to start and run with no luck. He has stock LSA injectors and a 92mm cable driven throttle body. It is a stock cam for now. It will run with the stock injector data but dumps a ton of fuel and surges. When I put in the LSA to LS1 injector data I found here on the forum, it will barely run. It always stalls out with the LSA data and the IAC count skyrockets. I managed to get it run if I set the injector flow data in the middle of the LSA and LS1 data but it was still very rich. We have tried adjusting the set screw and adjusting it just makes the car die sooner. It "runs" best with blade fully closed. It is a stock tbss map sensor with an adapter harness, and it appears map info is the same as what is in the LS1 file. We have verified no vacuum leaks as well.
Appreciate any help I can get