Despite the fact that some conspiracy theorists think it was a bomb, there is no evidence to support it.
Of course some people think Valujet 592 was a terrorist bomb and they probably think every single plane crash in history was a terrorist act.
The truth is, only a small percentage of plane crashes have been caused by criminal acts. Nearly all are caused by human error, mechanical failure, or most often, a combination of both.
IMO, the Valujet crash was one of the most disturbing in recent history (I don't think it was caused by a bomb), in that it disappeared in the swamp. The recovery operation had to be horrific.