This bolt is missing from the right side of the carb on my 81 4x4 with a 22r. Anyone know what size it is so I can replace it? Can air be sucked into this hole? Also this truck is a basketcase. I have to pour a little gas down the card and pump the hell out of the peddle to start it, then it idles around 2k. After I drive it aroud for 15 minutes or so the idle drops down to were it stalls if I let off the gas.