I have a 72 240z, but if i crack it an hold the key it seems to stay running, but dies as soon as i let off. Now i think it is only running cause the started is running it. I think its the timing gears an chain, think maybe they skip teeth or something. I brought it to tdc, an the rotor in the dist. isnt point where its suppose to be, but i ran the spark plug wires off of it, an it still didnt start, i know im getting spark an gas. but wont start, what else could it be besides the timing chain an gears.