Rebuilt trans help
You could as the gentleman above said have slipping clutches and such , However I beleave to determine what you have going on first torque managment should be disabled.
And then and attempt should be made to tune the car to work properly with the 3000 stall, Once thee things are done you should be able to give info that would alow a better evaluation if those things do not fix the problem ,
Check tuning first in this case is my advice
hope this helps
performabuilt







