Bugeye Impreza wrx slight hesitation

[Shaunj787]

Hello everyone, I have a 2001 bugeye Impreza that has a slight hesitation under load, it has no cel, it normally only happens once hot and it does chuck a little bit of black smoke out. I'm new to Subaru ownership so don't really know where to start.

Thanks all

[Scoobyghost]

Black smoke under load would suggest over fueling. Has it been modified in anyway?

[Shaunj787]

No it's big standard, the smoke is only slight and only when it's been revved up from idle and it pops a bit