Sudden rough engine, repetitive surging, odd burnt smell, oil good

Car ran good this am, after work, started car and noticed rough idle. As pulled out of parking lot, car ran rough, surging, seemed like wasn't hitting on all cylinders noticed burnt smell, didn't know if was rubber or oil, check engine light on flicker first, then on steady. Pulled into gas station, popped the hood, didn't see any problem, checked oil, ok, then noticed small crack in big rubber hose from air filter to intake manifold. Could this be the problem? I tried to sqeeze crack together but it didn't seem to make much difference.