No power climbing a hill from dead stop

ScottG wrote:
Not unusual for that eng to crack exhaust manifolds, is that where your slight leak is coming from? If it's bad enough you may be missing a lot of boost.
(BTW, it's a "Cummins")

The leak is at the exhaust manifold gasket. I over torque the bolt when replacing the turbo. I did not have room to use a torque wrench . Extremely disapointing to find after all that work. I do not believe the leak has got a lot worse, I bought a high temp caulk that is used on high temp pressure pipes which worked OK but i believe it is peeling off now. I hate to think about removing that manifold again, so hard to get at all the bolts.
The leak may have become worse now, but directly after i changed the turbo and the leak was very minimal I still could not climb the hill much better. So I feel the main problem is elsewhere.
Thanks for your help