Car won't idle.... again

Condition of the fuel tank and system? DIRT IE anything known as dirt and debri can play hell with idle

"Bad gas." Maybe, but doubtful. If you run the usual "pump gas" AKA alcoholized, water is usually not a problem

What do you have for a carb? My strategy for this "when I thought" "it might be dirt" (or water) was to take the carb apart as gently as possible and examine the contents of the fuel bowl. This requires NO beer, NO temper, and patience. What you want is to see "what's in there" and it might not be much.

Also, sometimes you can remove the idle screws right on the vehicle and blow a snorkel aerosol carb cleaner into the idle screw sockets, and down through the air bleeds.

Rough the idle screws back in. Start it up, get it running "fast idle." Remove the screws one at a time and put your finger over the hole for a couple of seconds. This causes intake vacuum to "blow" hard through the idle circuit.

Then warm it up and reset the idle screws.