Q: Carburetor issues or fuel system.

I like the 4 cylinder 5 spd gets decent mileage. But the fuel system is not so good. When i start it, it wants to die off the moment i let my foot of the gas pedal making it hard to drive because it has a clutch. I put the choke all the way down and then cranked it. Started right up but wanted to die off after 2 or 3 seconds. I replaced the fuel filter and that did absolutely nothing, i though it might be that because i'm guessing it has 200k because its at 67k but i know it has flipped over a couple times the previous owner also told me that to. I was thinking maybe the ignition ill go test that right now. But i don't know cleaned the spark plugs it has no misfires. Its hard for me to diagnose non electrical issues because i am a training to be a diesel mechanic but this is frustrating. I dumped 1/2 a can of seafoam in each carbuerator jet (because it is an aftermarket weber carb kit) and the other half in the gas tank it was a little better but really no improvements?.

My car has 200000 miles.
My car has a manual transmission.