Being a car that old it will have a carburettor not fuel injection. You will need to strip down the carb and clean out the blockage from the accelerator pump. If you remove the air cleaner from the carb intake you will see the accelerator spray tube in the top of the venturie. When you open the throttle quickley this should spray extra fuel into the top of the carb if it does not then you have a blockage or the pump unit has failed.
Nip down your local libary and borrow a workshop manual.