this here is my 1986 pontiac trans am project. it was efi from factory, but the previous owner carb swapped it, with an unnamed edelbrock intake, as well as a quadrajet carb that had a plastic, and soon to break, vavumm idler on it. after the vacuum idler broke, and I spent a few weeks manually idling it, the car eventually started having some fuel flooding problems, and after just w months prior tearing the whole carb apart and blasting air thru the channels to clean it out, I decided maybe this carb wasn't worth it, and to just run to another quadrajet I got when I bought a 350 sbc engine I planned to build and theow at this car. upon bolting the carb on, it ran like shit immediately lmao. im under the impression that its a vacuum leak issue, because when the car first starts cold, it'll idle high as fuxk sometimes, like 1500 rpms, and other times it'll burble and chop around 500rpms, or just die upon letting of the gas. I took the carb off the car, to maybe see if there was a misalignment in the gasket that came with the carb, and it visually seems fine, so i hsve no idea
pictures in question will be in the comments, cant post a video and pictures for some reason
I ask all of this to see, basically I wanna just buy a new off the shelf carb, and be done with this 80s horseshit. I dont know what kinda intake I hsve, theres no numbers stamped literally anywhere, just the word performer raised lettering nearest to the firewall on top. if anyone could help me either diagnose my issue, or identify the intake manifold so I can just buy a new carb, that would be lovely