You might want to try www.heavythrottle.com for any help troubleshooting.
If the only thing that was replaced is the Exhaust Manifold-turbo-piping up to the TB, I would recheck your piping connections, if your base idle settings are ok.
If the only thing that was replaced is the Exhaust Manifold-turbo-piping up to the TB, I would recheck your piping connections, if your base idle settings are ok.