help my 74' 318 wont idle

count the # of turns to get the (2) idle mixture screws in to lightly seated so you can easily return them to their original position(s) then take them out & shoot a 2 second blast of starting fluid into each screw hole then replace the screws. adapt one of those thin red straws to the SF can nozzle so you can get the straw in the hole(s) & blast em good.