how long has the car been sitting? if its been too long then it may have junk in the carburetor, the fuel filter may be plugged up, your rings may be collapsed which causes blow by in the cylinder and burns oil and causes a loss of power, if youre doing the work yourself then check with auto zone they rent tools. get a compression tester and test each cylinder. you can find the factors compression specs in either a haynes manuel or a chilton manuel. for a vehicle this old it could be a lot of things. depending on the milage you may just need an engine rebuild. good luck