No Pulling Power after Repair

[rtjohnson1982]

Hey everyone, I’m looking for any advice as I am at my wits end on what to do. I recently had the head replaced on my 2007 ISX and since getting it back have no pulling power when it’s needed most. It’s dogging out at about 1000 rpm and struggling. No smoke or check engine lights but the motor sounds different than before. Feel like it’s a turbo issue but the turbo was working before the repair. Truck cranks and idles great and feels completely normal below about 1000rpm but sounds terrible after it climbs past 1000rpm. Thank you for any help!