Okay, so say you play an instant or sorcery spell and then play Increasing Vengeance targeting it could you then play Swerve changing the target of Increasing Vengeance from the random instant or sorcery to itself?
If by "itself" you mean having Increasing Vengeance target itself, then no, you can't do that because rule 114.4 says
A spell or ability on the stack is an illegal target for itself.
Even if you could do that, it wouldn't do much because no matter how many times an Increasing Vengeance were to resolve copying itself, you would still end up with a single Increasing Vengeance.
If, on the other hand, you mean having Increasing Vengeance target Swerve, then you can do that but it wouldn't do much because once Increasing Vengeance starts to resolve Swerve would no longer be on the stack so the Increasing Vengeance would be countered for having no legal target.