Have you checked basics like blocked fuel filter, kinks in fuel lines? They are free or almost free.

need more info. If its in the arvo us it always driving down same piece of road?
Could be a blockage in carby jets or even somethobg in fuel tank.
any recent electrical work? Is it points or elec dizzy?
Give a better description. Could be a 2cent part or a few $$$$ hundred to fix. Not enough info yet