Rep Power: 0

2004 civic si, a while ago randomly had the issue of it dying. It's been sitting for a few months after I pushed it home. The only code that comes up is P0141 but that doesn't seem right. I did get a cheap after market cat but it was working fine for a year. When it does start (have to push gas) it runs for a minute roughly and then just dies. I usually get a loud POP so I'm thinking it has something to do with air or gas.