으러 가다

go somewhere to do something

Marks what a trip is for: you go, and this is the purpose. Half these lines are 먹으러 가다 — 삼겹살 먹으러 가자! and 오늘 밤에 피자 먹으러 갈래? — which is how you propose going out to eat. It needs a movement verb after it (가다, 오다, 다니다). If you only want to say you intend to do something, with no going involved, 으려고 하다 is the pattern you want instead.