2009 lmm new engine gutless need help!!

[hemi_power_3@hotmail.com]

Hey everyone, i have an 09 lmm, i had a killer tune on it, one of the bushings went in the engine, i replaced it with a built up engine. It was replaced in a shop. Ever snice i got it back it has had no power, not like the old engine it should have way more. My stock 95 cummins can spank it! I reflashed my tune into it and it does not make a difference still gutless. I need some help. i know alittle about tuning but not a whole lot. Worst of all is i dont want to go to a shop because i do not want a locked tune. What is the point in having a tuner and not being able to modify right?
So i was wondering if anyone would be willing to help me.
Thanks