morlock

I have a 67 Mustang with a 200 L6 3.3l engine and a 1 bbl carb. It was running fine til the filter got clogged. I replaced the filter and it ran fine for a little bit, now it will not run at an idle. It will only run if I have pressure on it and accelerating. I am still getting pressure from the fuel pump, and I am still filling up the fuel filter, it's one of the glass ones with replaceable cartridge. And gas is getting into the carberator I cleaned the carb out, the jet, the bowl, everything from the top end, and it is completely clean, the filter is clean. Basically everything up to the carb is clean, so is the top end. Can anyone tell me what is wrong with this that you may think. It's not a vacuum leak, cuz I checked that, and all the lines are in place. I am quite certain it is not an electrical problem. Can someone give me some help? Could it also be bad gas? Reply soon. Thank you.