once car warms up hot especially after sitting in traffic stumbles wants to die after leaving the light lowered float levels Holley carb have not checked fuel pressure
i have rubber line from pump to carbSounds like it could be vapor locking. Take some aluminum foil and loosely wrap the fuel line from the pump to the carb as a temporary test. Loosely wrapping it is the key...it's more of a crumple wrap that leaves as much air in the wrap as possible while getting the foil to stay on the line. This will help insulate the line from the heat. If the problem goes away with the foil...it's vapor locking in the line.