when i worked at a dyno shop this was a very common occurrence, either by the owner doing shade tree work or even better, other shops! and it was always the same: oh, it just needs tuned.
no, my friend. ain't no amount of tuning gonna sort that out.
Yep a shop is gonna want to tear it all apart and address all deficiencies otherwise they won't accept the car. No way to know what all is mickey moused up otherwise. And there is a nation wide shortage of auto mechanics these days to boot.
