Unlikely this was an engine issue.
Interesting reading in the article about the aircraft type:
https://diverdriver.com/pac-750xl/
Article includes a video of the aircraft stalling with 6 jumpers hanging on outside:
https://m.youtube.com/watch?v=mbaAai...ture=emb_title
It wouldn’t be the first time that the actions of a jumper led to an accident.