Not idling right??

Hey guys, so I'm new to club s12, I bought an 86 a little while ago for a good price because it needed a couple things. Basic info on it is that it has a dual cam ka swap, front end is mostly from an s13. Anyways, I replaced the power steering and also rewired the switch that came in it which is to prime it. The guy I got it from said that he put a Walbro electric fuel pump and switch to start it so it would be harder to steal. But don't know if that's the case. Basically the car wouldn't hold a charge and wouldn't stay idling if I didn't have my foot of the gas. So after I read wired the switch I hoped it would fix the idle part. It didn't. I thought it was just a cold start thing but even when I drive it for like 30 minutes, it will still die at a light or stop sign or even down hill if I don't keep giving it gas. If anyone has ideas on what it could be please let me know, I couldn't find anything when I searched for it. Thanks!

Bring up your idle until it doesn't die?

Check for vacuum leaks. When you put your foot on the gas does it smooth out?

I second checking for vacuum leaks. If you can replace all your vacuum lines. I did this on mine and the cars runs and idles so much better.

I use carb cleaner with a red nozzle and spray small amounts near vacuum hoses if idle picks up you found leak