Espain33$

I have. My 2000 EM1 with a B20z it hasn’t been on for about a month or so because of replacing head gasket so when I go to start it cranks but then seems to get stuck I’ve checked battery they said it is a good battery I checked wires spark plugs all new ext and just won’t change anything no check engine light I just don’t know what else to do here please if anyone could help would be greatly appreciated I will post a video of how it sounds