I'm not sure exactly what IMDb says about Steve Buscemi's role in 'Pulp Fiction' specifically. But he might have had a minor or cameo role in the movie.
Yes, Steve Buscemi was indeed in Pulp Fiction. In the movie, his character contributed to the complex web of stories and characters. His performance was part of what made Pulp Fiction such a cult classic, with his unique acting style blending in with the other great performances in the film.