[91 bird]

i would start out by making sure the timing is set properly, and the plugs and wires are in good condition. also, make sure the advance weights in the dist. are in good working order, ie. springs not rusted or broken,bushings are intact. it is located under the rotor. is the vaccume advance connected? then would look at the carb. does it need a rebiuld? hope ive helped some.