I have swapped an '08 4200 with E67 into a g-body. It has a turbo and regrind cams, so i'm struggling a little to get it to idle properly.

I replaced the stock trailblazer MAP with a 3 bar unit, 55567257. My issue is key on engine off, i'm reading 14.5 psi manifold pressure, and 13.1 psi Baro.

In my tune file I have Map sensor Linear 312.5 kpa and offset at -11.25. (Airflow,general, MAP characteristics menu)

I have selected supercharger=fitted, as well as applied the manifold vacuum patch.

Is there another area that needs to be altered to make the baro read correctly, or is it likely i have something else going on? It ran decently prior to this with the original MAP installed

Thanks for any advice!