ranger2nd75th

i am looking for someone to help me figure out an engine miss problem. the engine cuts out like a fuel problem. starts to spudder then cuts. if i let it sit for and hour it will start fine but when i put it in gear and give it gas it will go for a good 30 yards and start to cut out again. all fuel components are replaced. spark plugs and wires. spark unit still good. new battery and cables. dad thinks it might be a vacume or o2 sensor problem but i am not too familiar with either.