Has your timing chain streched to the point it has gone out or time so far it will not start? There is a plug on # 6 cylinder beside the spark plug. Remove it and slide a steel rod into the hole and turn the engine by HAND. Once you have established TDC, check your tdc mark on the pulley. If there is no sign of the mark rotate the engine one more time and check again. You can also remove the dist cap and rock the engine back and forth while watching the rotor. There should be no lag in the rotation of the rotor. If there is, its because of a timing chain problem. Or find a mechanic to help you out.. there are so many things that could trip you up if you are not familiar with engines.