If it acts like it's running out of fuel...Lot's of good suggestions here already.....Checking the float level is an easy start....Then after you've run the car check the center carb after it stalls and see if the carb is in fact out of fuel...Working the throttle after the stall to see if the accelerator pump is giving a shot is the first check to make sure it is in fact a fuel related issue....then you can work you're way from there....These checks cost you nothing but time....